Article(id=1236327388380983864, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236327378968965364, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2023.05.034, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1681920000000, receivedDateStr=2023-04-20, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772693019242, onlineDateStr=2026-03-05, pubDate=1696089600000, pubDateStr=2023-10-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772693019242, onlineIssueDateStr=2026-03-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772693019242, creator=13701087609, updateTime=1772693019242, updator=13701087609, issue=Issue{id=1236327378968965364, tenantId=1146029695717560320, journalId=1235980550691926019, year='2023', volume='43', issue='5', pageStart='1', pageEnd='177', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772693016997, creator=13701087609, updateTime=1772693111855, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236327776882577759, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236327378968965364, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236327776882577760, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236327378968965364, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=149, endPage=153, ext={EN=ArticleExt(id=1236327389576360592, articleId=1236327388380983864, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Effect of Interrupted Quenching on Microstructure and Fracture Toughness of 7N65 Aluminum Alloy, columnId=1236276108207902848, journalTitle=Mining and Metallurgical Engineering, columnName=MATERIALS, runingTitle=null, highlight=null, articleAbstract=

Interrupted quenching experiments were conducted to investigate the hardness (HV) and unit initiation energy (UIE) of 7N65 alloy samples at various temperatures with different hold time, and the relative TTP-HV and TTP-UIE contour diagrams were also plotted. The precipitation behavior of second phases at various temperatures was characterized by adopting scanning electron microscope and transmission electron microscope. The findings reveal that S-phase (Al₂CuMg) is the dominant grain boundary precipitate after the alloy is held at a temperature between 390 ℃and 450 ℃, and increases in grain size and numbers as hold time is prolonged. Thus the alloy has less fracture toughness and is prone to fragile fracture along with the broken grains. When the alloy sample is held at a temperature between 250 ℃and 390 ℃, precipitates at grain boundaries are predominated by η-phase (MgZn₂), which increases in the numbers and grain size as hold time is prolonged, leading to lower strength of inner grain, smaller difference in strength between inner grains and grain boundaries. Thus, the alloy has higher fracture toughness and is more prone to ductile fracture with more transgranular dimples.

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通过分级淬火实验研究了7N65合金在不同保温温度与不同保温时间下的硬度（HV）和单位裂纹形核功（UIE）变化，绘制了合金的TTP-HV曲线及TTP-UIE曲线。结合扫描电镜、透射电镜等表征方法，对不同温度下的第二相析出行为进行了研究。结果表明，高温（390~450 ℃）保温时，晶界析出相以S（Al₂CuMg）相为主，随着保温时间延长，其尺寸与数量增大，合金断裂韧性下降，断裂方式为沿扁平晶粒断开的脆性断裂；低温（250~390 ℃）保温时，晶界析出相以 η（MgZn₂）相为主，随着保温时间延长，晶界特征变化不大，晶内η相数量增加、尺寸增大，导致晶内强度降低，晶内-晶界强度差减小，合金断裂韧性上升，断裂方式为穿晶断裂。

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林立健（1997—），男，浙江湖州人，硕士研究生，主要研究方向为高强铝合金及其制备技术。

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林立健（1997—），男，浙江湖州人，硕士研究生，主要研究方向为高强铝合金及其制备技术。

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