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The phase structure, microstructure and mechanical properties of Fe46-xNi20Co20Cr10V4Alx (x=5, 8, 12, 15) high-entropy alloys with different Al contents (atom fraction, %) were systematically investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and performing uniaxial tensile test. The results show that with the increase of Al content, the phase structure of Fe46-xNi20Co20Cr10V4Alx high-entropy alloys transforms from single-phase structure of face-centered cubic (FCC) to dual-phase structure of FCC and body-centered cubic (BCC). Also, the strength increases and ductility decreases. The Fe34Ni20Co20Cr10V4Al12 high-entropy alloy annealed at 900 ℃ exhibits an excellent strength-ductility balance, with yield strength, tensile strength and elongation to failure at 593 MPa, 1009 MPa and 32.13%, respectively. With Al content of 5%, the as-cast and annealed high-entropy alloys remain single FCC phase. However, with Al content of 8%, 12% and 15%, the high-entropy alloys all become FCC-BCC phase. The annealing treatment promotes the precipitation of BCC phase, and the proportion of BCC phase increases with increasing annealing temperature.
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通过XRD、SEM、EBSD和单轴拉伸测试,对不同Al含量(原子分数,%)Fe46-xNi20Co20Cr10V4Alx(x=5,8,12,15)高熵合金的相结构、显微组织和力学性能进行了系统研究。结果表明,随着Al含量增加,Fe46-xNi20Co20Cr10V4Alx高熵合金相结构由FCC单相转变为FCC+BCC双相结构,且强度随之增加,而塑性降低。其中,Fe34Ni20Co20Cr10V4Al12高熵合金在900 ℃退火处理后,具有极好的强塑性匹配,其屈服强度、抗拉强度和断裂延伸率分别为593 MPa、1 009 MPa和32.13%。Al含量5%时,铸态和退火态高熵合金均为单一FCC相;Al含量8%,12%和15%时,高熵合金为FCC+BCC双相结构,退火处理促进了BCC相的析出,随着退火温度升高,BCC相占比增加。
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尹荣(1999—),女,安徽阜阳人,硕士研究生,主要研究方向为高熵合金的微观组织和力学性能。E-mail:yinrong9999@163.com
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尹荣(1999—),女,安徽阜阳人,硕士研究生,主要研究方向为高熵合金的微观组织和力学性能。E-mail:yinrong9999@163.com
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41(11): 1372-1378., articleTitle=Calculations of mixing enthalpy and mismatch entropy for ternary amorphous alloys, refAbstract=null)], funds=[Fund(id=1240651356856447917, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, awardId=51871248, language=CN, fundingSource=国家自然科学基金(51871248), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1240651351542264187, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, xref=null, ext=[AuthorCompanyExt(id=1240651351550652797, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, companyId=1240651351542264187, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China), AuthorCompanyExt(id=1240651351642927498, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, companyId=1240651351542264187, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中南大学 材料科学与工程学院,湖南 长沙 410083)])], figs=[ArticleFig(id=1240651354738324182, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=EN, label=null, caption=null, figureFileSmall=DrPvxEW8rWylf7zbV7LfvA==, figureFileBig=iqLKDGNOqsD7ei73vvMUEw==, tableContent=null), ArticleFig(id=1240651354864153320, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=CN, label=图1, caption=
Fe46-xNi20Co20Cr10V4Alx高熵合金铸态和退火态试样XRD图谱和700 ℃退火态EDS谱图(a1)A5试样XRD图谱;(a2)A5试样EDS谱图;(b1)A8试样XRD图谱;(b2)A8试样EDS谱图;(c1)A12试样XRD图谱;(c2)A12试样EDS图谱;(d1)A15试样XRD图谱;(d2)A15试样EDS谱图
, figureFileSmall=DrPvxEW8rWylf7zbV7LfvA==, figureFileBig=iqLKDGNOqsD7ei73vvMUEw==, tableContent=null), ArticleFig(id=1240651355002565370, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=EN, label=null, caption=null, figureFileSmall=hFAUP8OMoXsUwFHeHhmrpA==, figureFileBig=yqS6Gg1uGO03HlE5t949IA==, tableContent=null), ArticleFig(id=1240651355099034371, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=CN, label=图2, caption=
Fe46-xNi20Co20Cr10V4Alx高熵合金铸态和退火态试样SEM图像(a1)A5-cast;(a2)A5-700;(a3)A5-800;(a4)A5-900;(b1)A8-cast;(b2)A8-700;(b3)A8-800;(b4)A8-900;(c1)A12-cast;(c2)A12-700;(c3)A12-800;(c4)A12-900;(d1)A15-cast;(d2)A15-700;(d3)A15-800;(d4)A15-900
, figureFileSmall=hFAUP8OMoXsUwFHeHhmrpA==, figureFileBig=yqS6Gg1uGO03HlE5t949IA==, tableContent=null), ArticleFig(id=1240651355224863505, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=EN, label=null, caption=null, figureFileSmall=HGKMhANrck3dNOMtes1RqA==, figureFileBig=noPcOTTVdytGPlWPYTGJPw==, tableContent=null), ArticleFig(id=1240651355338109726, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=CN, label=图3, caption=
Fe46-xNi20Co20Cr10V4Alx高熵合金铸态试样EBSD图(a1)A8-cast,IPF;(a2)A8-cast,GB图;(a3)A8-cast,相分布图;(b1)A12-cast,IPF;(b2)A12-cast,GB图;(b3)A12-cast,相分布图
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Fe46-xNi20Co20Cr10V4Alx高熵合金力学性能(a)A5-900、A8-900、A12-900和A15-900试样的工程应力应变曲线;(b)A12-700、A12-800和A12-900试样的工程应力-应变曲线
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Fe46-xNi20Co20Cr10V4Alx高熵合金的拉伸断口形貌(a)A5-900;(b)A8-900;(c)A12-900;(d)A15-900
, figureFileSmall=3pAIWR75exP0+vxf+hP6pg==, figureFileBig=PFttYsFMDIDGYTUi+X+7wQ==, tableContent=null), ArticleFig(id=1240651356130833256, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 热处理工艺 | 相应试样名称 |
|---|
| 铸态 | A5-cast,A8-cast,A12-cast,A15-cast |
| 均匀化+热轧+700 ℃退火1 h | A5-700,A8-700,A12-700,A15-700 |
| 均匀化+热轧+800 ℃退火1 h | A5-800,A8-800,A12-800,A15-800 |
| 均匀化+热轧+900 ℃退火1 h | A5-900,A8-900,A12-900,A15-900 |
), ArticleFig(id=1240651356290216822, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=CN, label=表1, caption=
Fe46-xNi20Co20Cr10V4Alx(x=5,8,12,15)高熵合金试样处理过程及相应试样名称
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| 热处理工艺 | 相应试样名称 |
|---|
| 铸态 | A5-cast,A8-cast,A12-cast,A15-cast |
| 均匀化+热轧+700 ℃退火1 h | A5-700,A8-700,A12-700,A15-700 |
| 均匀化+热轧+800 ℃退火1 h | A5-800,A8-800,A12-800,A15-800 |
| 均匀化+热轧+900 ℃退火1 h | A5-900,A8-900,A12-900,A15-900 |
), ArticleFig(id=1240651356428628865, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 合金名称 | 屈服强度/MPa | 抗拉强度/MPa | 断裂延伸率/% |
|---|
| A5-900 | 173±2 | 565±5 | 59.25±0.52 |
| A8-900 | 371±6 | 711±3 | 32.33±0.27 |
| A12-700 | 623±11 | 1 045±12 | 26±0.18 |
| A12-800 | 595±5 | 1 029±9 | 30.88±0.21 |
| A12-900 | 593±4 | 1 009±11 | 32.13±0.39 |
| A15-900 | 878±7 | 1 240±16 | 19.38±0.26 |
), ArticleFig(id=1240651356525097868, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631740755136664, language=CN, label=表2, caption=
Fe46-xNi20Co20Cr10V4Alx高熵合金的屈服强度、抗拉强度和断裂延伸率
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| 合金名称 | 屈服强度/MPa | 抗拉强度/MPa | 断裂延伸率/% |
|---|
| A5-900 | 173±2 | 565±5 | 59.25±0.52 |
| A8-900 | 371±6 | 711±3 | 32.33±0.27 |
| A12-700 | 623±11 | 1 045±12 | 26±0.18 |
| A12-800 | 595±5 | 1 029±9 | 30.88±0.21 |
| A12-900 | 593±4 | 1 009±11 | 32.13±0.39 |
| A15-900 | 878±7 | 1 240±16 | 19.38±0.26 |
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