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Article(id=1241768047304839574, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241768035548205179, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2024.01.032, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1692979200000, receivedDateStr=2023-08-26, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773990173412, onlineDateStr=2026-03-20, pubDate=1706716800000, pubDateStr=2024-02-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773990173412, onlineIssueDateStr=2026-03-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773990173412, creator=13701087609, updateTime=1773990173412, updator=13701087609, issue=Issue{id=1241768035548205179, tenantId=1146029695717560320, journalId=1235980550691926019, year='2024', volume='44', issue='1', pageStart='1', pageEnd='178', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773990170609, creator=13701087609, updateTime=1773993209826, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241780783011140021, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241768035548205179, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241780783015334326, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241768035548205179, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=147, endPage=151, ext={EN=ArticleExt(id=1241768049154527657, articleId=1241768047304839574, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar, columnId=1236276108207902848, journalTitle=Mining and Metallurgical Engineering, columnName=MATERIALS, runingTitle=null, highlight=null, articleAbstract=

The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated. The results show that the alloys treated by two-stage aging and re-aging (TSR), retroregression and re-aging (RRA), and non-isothermal aging (NIA), compared to the treatment with T73, all present better intergranular corrosion (IGC) resistance, with the maximum corrosion depth down from 70 μm to 19, 48, and 30 μm, respectively. Compared to those treated by RRA and NIA, the TSR-treated alloy has the similar tensile strength and yield strength, but obviously superior IGC. After the treatment of T73, TSR, RRA, and NIA, the alloy has its grain boundary precipitates with average size of 27.7, 39.2, 31.6, and 25.5 nm, respectively, and matrix precipitates with average size of 8.1, 10.2, 10.9, and 11.0 nm, respectively.

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研究了时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响。结果表明，合金经双级+再时效、回归再时效和非等温时效处理后，均获得了优于T73时效处理的抗晶间腐蚀性能，最大腐蚀深度由70 μm分别降至19、48和30 μm。合金经过双级+再时效处理后，获得了与回归再时效和非等温时效处理样品相近的抗拉强度和屈服强度，而抗晶间腐蚀性能明显优于回归再时效和非等温时效。合金经T73、双级+再时效、回归再时效和非等温时效处理后，晶界析出相平均尺寸分别为27.7、39.2、31.6和25.5 nm，基体沉淀相平均尺寸分别为8.1、10.2、10.9和11.0 nm。

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叶凌英（1981—），男，吉林九台人，博士，教授，主要从事高性能铝合金组织与性能调控研究。E-mail：
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高靖靖（1987—），男，河南信阳人，硕士，高级工程师，主要从事紧固件设计及材料研究。E-mail：

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高靖靖（1987—），男，河南信阳人，硕士，高级工程师，主要从事紧固件设计及材料研究。E-mail：

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高靖靖（1987—），男，河南信阳人，硕士，高级工程师，主要从事紧固件设计及材料研究。E-mail：

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caption=null, figureFileSmall=rbqRCwjj3onniOm6VAKbWA==, figureFileBig=3uAzbDQFRks7BivQFQnQbA==, tableContent=null), ArticleFig(id=1241779786926854350, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=CN, label=图6, caption=不同时效工艺处理后晶界附近组织, figureFileSmall=rbqRCwjj3onniOm6VAKbWA==, figureFileBig=3uAzbDQFRks7BivQFQnQbA==, tableContent=null), ArticleFig(id=1241779787077849301, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
ZnMgCuFeCrTiSiMnNiAl
5.822.631.680.160.200.020.060.020.01余量
), ArticleFig(id=1241779787220455646, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=CN, label=表1, caption=

Al-Zn-Mg-Cu合金化学成分（质量分数）

, figureFileSmall=null, figureFileBig=null, tableContent=
ZnMgCuFeCrTiSiMnNiAl
5.822.631.680.160.200.020.060.020.01余量
), ArticleFig(id=1241779787375644902, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺简称时效参数
T73T73120 ℃/5 h+177 ℃/8 h
双级时效+再时效TSR120 ℃/5 h+177 ℃/24 h+120 ℃/24 h
回归再时效RRA120 ℃/5 h+200 ℃/4 h+120 ℃/24 h
非等温时效NIA120 ℃/5 h+200 ℃/4 h+200 ℃→100 ℃（V=20 ℃/h）
), ArticleFig(id=1241779787505668337, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=CN, label=表2, caption=

时效工艺及参数

, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺简称时效参数
T73T73120 ℃/5 h+177 ℃/8 h
双级时效+再时效TSR120 ℃/5 h+177 ℃/24 h+120 ℃/24 h
回归再时效RRA120 ℃/5 h+200 ℃/4 h+120 ℃/24 h
非等温时效NIA120 ℃/5 h+200 ℃/4 h+200 ℃→100 ℃（V=20 ℃/h）
), ArticleFig(id=1241779787702800632, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺电导率/%IACS硬度（HV）抗拉强度/MPa屈服强度/MPa延伸率/%
T7336.9±0.1170.4±1.2607.7±4.4567.2±5.212.5±0.4
TSR39.8±0.1154.6±1.2518.8±1.1450.3±3.613.9±0.2
RRA38.9±0.1154.8±3.1520.7±2.1454.6±1.713.2±0.6
NIA39.4±0.1155.9±2.6523.3±1.6456.3±2.313.5±0.1
), ArticleFig(id=1241779787874767106, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=CN, label=表3, caption=

不同时效工艺处理后合金的电导率和力学性能

, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺电导率/%IACS硬度（HV）抗拉强度/MPa屈服强度/MPa延伸率/%
T7336.9±0.1170.4±1.2607.7±4.4567.2±5.212.5±0.4
TSR39.8±0.1154.6±1.2518.8±1.1450.3±3.613.9±0.2
RRA38.9±0.1154.8±3.1520.7±2.1454.6±1.713.2±0.6
NIA39.4±0.1155.9±2.6523.3±1.6456.3±2.313.5±0.1
), ArticleFig(id=1241779788000596241, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺介质σ/MPaδ/%应力损失/%ISSRT/%
T7350 ℃-3.5%NaCl562.8±2.213.5±0.12.0±0.52.8±0.6
50 ℃-硅油574.0±2.414.5±0.3
TSR50 ℃-3.5%NaCl485.0±2.112.9±0.11.5±0.42.2±0.2
50 ℃-硅油492.5±1.813.7±0.1
RRA50 ℃-3.5%NaCl518.1±1.711.1±0.12.6±0.33.0±0.2
50 ℃-硅油531.8±2.011.6±0.1
NIA50 ℃-3.5%NaCl521.8±2.211.6±0.12.2±0.42.6±0.2
50 ℃-硅油533.4±1.912.1±0.1
), ArticleFig(id=1241779788109648152, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241768047304839574, language=CN, label=表4, caption=

不同时效工艺处理后合金慢应变速率拉伸应力腐蚀结果

, figureFileSmall=null, figureFileBig=null, tableContent=
时效工艺介质σ/MPaδ/%应力损失/%ISSRT/%
T7350 ℃-3.5%NaCl562.8±2.213.5±0.12.0±0.52.8±0.6
50 ℃-硅油574.0±2.414.5±0.3
TSR50 ℃-3.5%NaCl485.0±2.112.9±0.11.5±0.42.2±0.2
50 ℃-硅油492.5±1.813.7±0.1
RRA50 ℃-3.5%NaCl518.1±1.711.1±0.12.6±0.33.0±0.2
50 ℃-硅油531.8±2.011.6±0.1
NIA50 ℃-3.5%NaCl521.8±2.211.6±0.12.2±0.42.6±0.2
50 ℃-硅油533.4±1.912.1±0.1
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时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响
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高靖靖 1 , 李旭健 1 , 付建建 1 , 周玉宝 1 , 马勇 1 , 黄青梅 2 , 杨献文 2 , 叶凌英 2
矿冶工程杂志 | 材料 2024,44(1): 147-151
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矿冶工程杂志 | 材料 2024, 44(1): 147-151
时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响
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高靖靖1 , 李旭健1, 付建建1, 周玉宝1, 马勇1, 黄青梅2, 杨献文2, 叶凌英2
作者信息
  • 1.河南省紧固连接技术重点实验室，河南　信阳　464000
  • 2.中南大学　材料科学与工程学院，湖南　长沙　410083

    • 高靖靖（1987—），男，河南信阳人，硕士，高级工程师，主要从事紧固件设计及材料研究。E-mail：

通讯作者:

叶凌英（1981—），男，吉林九台人，博士，教授，主要从事高性能铝合金组织与性能调控研究。E-mail：
Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar
Jingjing GAO1 , Xujian LI1, Jianjian FU1, Yubao ZHOU1, Yong MA1, Qingmei HUANG2, Xianwen YANG2, Lingying YE2
Affiliations
  • 1.Henan Key Laboratory of Fastening Connection Technology, Xinyang 464000, Henan, China
  • 2.School of Material Science and Engineering, Central South University, Changsha 410083, Hunan, China
出版时间: 2024-02-01 doi: 10.3969/j.issn.0253-6099.2024.01.032
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研究了时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响。结果表明，合金经双级+再时效、回归再时效和非等温时效处理后，均获得了优于T73时效处理的抗晶间腐蚀性能，最大腐蚀深度由70 μm分别降至19、48和30 μm。合金经过双级+再时效处理后，获得了与回归再时效和非等温时效处理样品相近的抗拉强度和屈服强度，而抗晶间腐蚀性能明显优于回归再时效和非等温时效。合金经T73、双级+再时效、回归再时效和非等温时效处理后，晶界析出相平均尺寸分别为27.7、39.2、31.6和25.5 nm，基体沉淀相平均尺寸分别为8.1、10.2、10.9和11.0 nm。

Al-Zn-Mg-Cu  /  挤压棒材  /  时效工艺  /  双级+再时效  /  回归再时效  /  非等温时效  /  组织  /  力学性能  /  抗腐蚀性能

The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated. The results show that the alloys treated by two-stage aging and re-aging (TSR), retroregression and re-aging (RRA), and non-isothermal aging (NIA), compared to the treatment with T73, all present better intergranular corrosion (IGC) resistance, with the maximum corrosion depth down from 70 μm to 19, 48, and 30 μm, respectively. Compared to those treated by RRA and NIA, the TSR-treated alloy has the similar tensile strength and yield strength, but obviously superior IGC. After the treatment of T73, TSR, RRA, and NIA, the alloy has its grain boundary precipitates with average size of 27.7, 39.2, 31.6, and 25.5 nm, respectively, and matrix precipitates with average size of 8.1, 10.2, 10.9, and 11.0 nm, respectively.

Al-Zn-Mg-Cu  /  extruded bar  /  aging treatment  /  two-stage aging and re-aging (TSR)  /  retroregression and reaging (RRA)  /  non-isothermal aging (NIA)  /  microstructure  /  mechanical properties  /  corrosion resistance performance
高靖靖, 李旭健, 付建建, 周玉宝, 马勇, 黄青梅, 杨献文, 叶凌英. 时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响. 矿冶工程杂志, 2024 , 44 (1) : 147 -151 . DOI: 10.3969/j.issn.0253-6099.2024.01.032
Jingjing GAO, Xujian LI, Jianjian FU, Yubao ZHOU, Yong MA, Qingmei HUANG, Xianwen YANG, Lingying YE. Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar[J]. Mining and Metallurgical Engineering, 2024 , 44 (1) : 147 -151 . DOI: 10.3969/j.issn.0253-6099.2024.01.032
正文
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Al-Zn-Mg-Cu合金是一种可时效强化的铝合金，因强度高、韧性好和抗疲劳性能良好而被广泛应用于航空航天和轨道交通等领域[1-4]，然而基于该合金的成分特性，其对晶间腐蚀（intergranular corrosion，IGC）和应力腐蚀开裂（stress corrosion cracking，SCC）表现出较高的敏感性[1,5-6]。文献[7]发现回归再时效（retrogression and re-aging，RRA）能协调样品中晶内和晶界的析出相，从而获得与T6态合金相近的强度水平和比过时效T7X样品更优异的抗腐蚀性能。文献[8]研究了非等温时效（non-isothermal aging treatment，NIA）温度变化期间析出相的形核、生长和粗化行为，发现除温度外，加热速率也会影响析出相的析出特征。
本文以一种Al-Zn-Mg-Cu合金挤压棒材为原料，针对其力学性能、抗IGC和SCC协同提高的需求，研究并讨论了T73、双级时效+再时效（two-stage+re-aging，TSR）、RRA和NIA等时效工艺对合金力学性能和抗腐蚀性能的影响。
1　实验材料与方法
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实验材料为Al-Zn-Mg-Cu合金挤压棒材，直径12 mm，具体化学成分如表1所示。将原材料进行450 ℃/1 h+490 ℃/1 h双级固溶处理后，经室温水淬后进行时效处理，淬火转移时间小于5 s，具体时效工艺及参数见表2，其中T73工艺参数按AMS 2770H—2006《锻造铝合金零件热处理》标准选取。
使用同一试样测试电导率、硬度，测试前保证试样待测面光滑平整。采用电导率仪（Fischer SMP 350）测量电导率。硬度测试在显微硬度计（HVS-1000S）上进行，加载载荷19.61 N，加载时间15 s。在电子万能试验机（DDL100）上进行室温拉伸实验，室温拉伸试样沿挤压方向选取，标距长度50 mm，直径10 mm，拉伸速度2 mm/min，取3个有效平行样的平均值作为实验最终结果。按照GB/T 7998—2005《铝合金晶间腐蚀测定方法》进行晶间腐蚀试验。棒材纵截面为工作面，试样在恒温水浴锅中浸泡6 h，腐蚀溶液成分为：1 L H2O+57 g NaCl+10 mL H2O2，温度控制在35 ℃左右，试样面容比4 mm2/mL。浸泡实验完成后，切取横截面组织观察晶间腐蚀情况，并测量最大腐蚀深度。TEM试样预磨至约80 μm，接着用冲孔器制成Φ3 mm的圆片，再用RL-2型减薄仪进行双喷减薄处理，温度和电压分别控制在-30 ℃和20 V左右。采用透射电子显微镜（FEI-TecnaiG2 20）分析材料组织结构，加速电压为200 kV。
2　实验结果
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2.1　力学性能和电导率
经不同时效工艺处理后，Al-Zn-Mg-Cu合金电导率和力学性能结果见表3。本文突破了AMS 2770H—2006标准中规定的T73工艺第二级时效时间限制，采取120 ℃/5 h+177 ℃/24 h双级时效和120 ℃/24 h再时效工艺，电导率可显著提高至39.8%IACS。此外，经RRA和NIA处理后，合金的电导率略低于TSR工艺，而硬度和强度差别不大，延伸率略有下降。相较于RRA，采用NIA处理的合金的电导率提升了0.5% IACS，硬度、强度和延伸率稍有提高，合金时效时间由33 h降至14 h。
2.2　析出相分析
图1为Al-Zn-Mg-Cu合金经不同时效工艺处理后晶界析出相（grain boundary precipitates，GBPs）的TEM明场像。从图1可以看出，经过T73处理后，合金中的GBPs连续、紧密地沿晶界分布，其平均尺寸为27.7 nm。合金经TSR、RRA和NIA处理后，GBPs形态和分布与T73工艺相比有明显差异，GBPs由连续分布变为不连续分布，且间距变大。经TSR、RRA和NIA处理后，GBPs的平均尺寸分别为39.2、31.6和25.5 nm。
Al-Zn-Mg-Cu合金经不同时效工艺处理后基体析出相（matrix precipitates，MPs）的TEM明场像见图2。从图2可以看出，经T73处理后，数量较多的MPs均匀弥散地分布在铝基体内，其平均尺寸为8.1 nm。合金经TSR、RRA和NIA处理后，MPs数量与T73工艺相比明显减少，且在部分区域出现了粗大的析出相，弥散程度均有不同程度地降低，MPs平均尺寸分别为10.2、10.9和11.0 nm。
2.3　晶间腐蚀性能
图3为Al-Zn-Mg-Cu合金经过不同时效工艺处理及晶间腐蚀液浸泡6 h后的金相组织显微图。合金经T73处理后，晶间腐蚀沿晶界发生并扩展至合金基体深处，部分晶粒形成腐蚀产物并发生堆积，其在脱离金属基体后形成深度均匀且相对连续的腐蚀坑，最大腐蚀深度约70 μm。合金经TSR、RRA和NIA处理后，没有明显的网格状腐蚀花纹，只存在一些不连续分布的点蚀坑。不同时效工艺处理后晶间腐蚀坑的深度略有不同，TSR、RRA和NIA时效处理后的晶间腐蚀坑最大深度分别为19、48和30 μm。
2.4　慢应变速率拉伸应力腐蚀开裂性能
Al-Zn-Mg-Cu合金经过不同时效工艺处理后的慢应变速率拉伸应力应变曲线见图4，其为3组平行样的平均值。从图4可以看出，试样经过不同时效工艺处理后在50 ℃-硅油中的强度和伸长率均大于合金在50 ℃-3.5%NaCl溶液中的强度和伸长率，这主要是因为50 ℃-3.5%NaCl溶液中的Cl-具有较强的腐蚀性，在破坏合金表面的氧化膜后会进一步腐蚀铝基体，导致合金性能变差。
为了评价不同时效工艺处理后合金的慢应变速率拉伸应力腐蚀开裂性能，将试验得到的数据加以综合处理，得到应力腐蚀敏感指数ISSRT，其计算公式如下：
式中Rm为抗拉强度；A为断后伸长率。应力腐蚀敏感指数ISSRT越大，说明合金对应力腐蚀开裂越敏感，合金抗应力腐蚀开裂性能越差。
Al-Zn-Mg-Cu合金经不同时效工艺处理后慢应变速率拉伸应力腐蚀性能见表4。50 ℃-3.5%NaCl溶液中的Cl-具有较强的活性和腐蚀性，会在不同程度上侵蚀时效处理后的合金，在一定程度上造成合金强度（抗拉强度）和韧性（伸长率）损失。合金分别进行T73、TSR、RRA和NIA时效处理后，抗拉强度损失率分别为2.0%、1.5%、2.6%和2.2%。经T73、TSR、RRA和NIA时效处理后，合金抗应力腐蚀敏感指数ISSRT分别为2.8%、2.2%、3.0%和2.6%，差别不大。
图5为Al-Zn-Mg-Cu合金经不同时效工艺处理后慢应变速率拉伸应力腐蚀开裂断口的SEM图。从图5可以清晰看出，合金经TSR处理后在50 ℃-3.5%NaCl溶液中腐蚀，有大量韧窝形成，为以穿晶断裂为主的混合型断裂。合金经T73、RRA和NIA处理后在50 ℃-3.5%NaCl溶液中发生了比较明显的腐蚀，部分腐蚀产物发生堆积形成比较明显的腐蚀团簇状产物，在腐蚀稍微严重的区域，大片腐蚀产物堆积形成异于基体的明亮区域。NIA处理后的样品在50 ℃-3.5%NaCl溶液中腐蚀，只存在少量离散分布的腐蚀团状产物，而T73和RRA处理后的样品均存在大面积腐蚀区域。所有样品在50 ℃-硅油中的断口形貌差别不大，均存在大量韧窝，是以穿晶断裂为主的混合型断裂。
3　讨论
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3.1　时效处理对合金力学性能的影响
Al-Zn-Mg-Cu合金的力学性能与MPs和GBPs尺寸、数量和分布等因素有着密不可分的联系，时效过程又显著影响合金析出相的析出行为[9-10]。在自然时效或人工时效早期，Al-Zn-Mg-Cu合金微观组织中会形成与铝基体共格的GP（Ⅰ，Ⅱ）区和半共格的η′析出相，二者均具有较小的尺寸且呈弥散分布，在合金发生变形时能有效钉扎位错，起到较好的强化作用。合金在较高时效温度下时，GP（Ⅰ，Ⅱ）区和η′析出相逐渐长大形成与铝基体非共格的η析出相。因为η析出相尺寸与GP（Ⅰ，Ⅱ）区和η′析出相相比更加粗大，其在合金发生变形时起到的钉扎效果较弱，导致合金强度在一定程度上有所降低。
由图2可知，经过不同时效工艺处理后，MPs的析出行为存在一定差异。经T73处理后，MPs平均尺寸为8.1 nm，均匀弥散地分布在铝基体内，起到的强化效果较好，合金抗拉强度和屈服强度分别达到了607.7 MPa和567.2 MPa。经过TSR、RRA和NIA处理后，由于在高温阶段停留的时间相对较久，MPs会在一定程度上长大，其平均尺寸由8.1 nm分别增至10.2、10.9和11.0 nm。与T73工艺相比，MPs数量明显减少，在铝基体部分区域出现粗大的η析出相，且在分布的均匀程度上也稍差于T73工艺。这三种工艺处理的样品基体内MPs析出行为没有太大差异，其强度也没有太大差异，但均稍低于T73处理后样品的强度。
3.2　时效处理对合金综合抗腐蚀性能的影响
Al-Zn-Mg-Cu合金的综合抗腐蚀性能与GBPs的大小、形貌和连续程度等因素有着密不可分的联系[11-12]。一般来说，Al-Zn-Mg-Cu合金中腐蚀优先在GBPs处产生，并沿晶界扩展[13]。不同时效工艺处理后晶界附近的组织如图6所示。经T73处理后，合金中的GBPs沿晶界连续分布，腐蚀一旦发生就会沿连续析出的GBPs形成腐蚀扩展通道，因此样品中出现了明显的晶间腐蚀，腐蚀情况相对严重。
经过TSR、RRA和NIA处理后，GBPs连续分布程度明显降低，在这种情况下，虽然腐蚀仍在GBPs处发生，但粗大且不连续的GBPs破坏了沿晶界扩展的腐蚀通道，阻碍了腐蚀进程。因此，在这三种时效制度下，合金抗晶间腐蚀性能均较T73工艺有不同程度地提高。其中，合金经TSR处理后表现出适宜的抗晶间腐蚀性能，并在慢应变速率拉伸应力腐蚀开裂性能测试中表现优异，在50 ℃-3.5%NaCl溶液中也没有发生腐蚀，说明合金经TSR处理后具有较好的综合抗腐蚀性能。
4　结论
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1）合金经TSR、RRA和NIA时效处理后，均获得优于T73时效处理所得样品的抗晶间腐蚀性能，最大腐蚀深度由70 μm分别降至19、48和30 μm。
2）合金经TSR处理后，与RRA和NIA处理相比，抗拉强度和屈服强度基本没有变化，抗晶间腐蚀性能明显优于RRA和NIA处理的样品。应力腐蚀敏感指数ISSRT仅2.2%，且在50 ℃-3.5%NaCl溶液中并未观察到腐蚀现象。
3）合金分别进行T73、TSR、RRA和NIA处理后，GBPs尺寸分别为27.7、39.2、31.6和25.5 nm；MPs尺寸分别为8.1、10.2、10.9和11.0 nm。
4）合金经TSR时效处理后能获得较高的强度和较好的抗腐蚀性能，同时实现力学性能和腐蚀性能的提高。
基金
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  • 河南省紧固连接技术重点实验室开放课题(JGLJ2208)
文献
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doi: 10.3969/j.issn.0253-6099.2024.01.032
  • 接收时间：2023-08-26
  • 首发时间：2026-03-20
  • 出版时间：2024-02-01
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  • 收稿日期：2023-08-26
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河南省紧固连接技术重点实验室开放课题(JGLJ2208)
作者信息
    1.河南省紧固连接技术重点实验室，河南　信阳　464000
    2.中南大学　材料科学与工程学院，湖南　长沙　410083

通讯作者:

叶凌英（1981—），男，吉林九台人，博士，教授，主要从事高性能铝合金组织与性能调控研究。E-mail：
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