Effect of thermo-mechanical treatment process on microstructure and mechanical properties of 2A97 Al-Li alloy  

形变热处理工艺对铝锂合金2A97显微组织和力学性能的影响(英文)

作　　者：高崇[1] 栾阳[2] 于俊川[1] 马岳[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院航空航天材料和性能教育部重点实验室,北京100191 [2]辽宁对外经贸学院国际经济贸易学院,大连116052

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第7期2196-2202,共7页中国有色金属学报（英文版）

摘　　要：2A97 Al-Li alloy was processed by thermo-mechanical treatment at different pre-stretch deformations of 0, 3% and 6%. The microstrucatre observation results reveal that some δ＇ and T1 precipitates are found in a（Al） matrix of 2A97 alloy processed by the heat treatment with no pre-stretch deformation. When the pre-stretch deformation is 3% and 6%, respectively, amounts of tiny T1 and a few of S＇ precipitates precipitates are observed in the microstructures of 2A97 alloy. The tensile test results show that the tensile properties of 2A97 alloys are improved via thermo-mechanical treatment. When the pre-stretch deformation is from 0, 3% to 6%, the ultimate tensile strength values of the 2A97 alloys increase gradually from 447.7, 516.5 to 534.3 MPa, and the elongations decrease from 17.6%, 12.8% to 10.2%, respectively. Moreover, with increasing pre-stretch deformation amount from 0 to 6%, the in-plane anisotropy value of 2A97 alloys becomes more obvious.采用不同(0、3%和6%)的预拉伸变形的形变热处理强化工艺处理2A97铝锂合金。显微组织研究结果表明,在无预拉伸变形的热处理2A97合金中发现了δ′和T1两种强化相;当预变形量为3%和6%时,大量细小的T1相析出,且低观察到少量S′相。拉伸测试结果表明,变形热处理对2A97合金的拉伸性能具有显著影响,且随着预拉伸变形量由0、3%变化到6%,合金的抗拉强度分别由447.7、516.5提高到534.3 MPa,而伸长率相应地由17.6%、12.8%降低到10.2%。此外,随着预拉伸变形由0增加到6%,2A97合金的各向异性更显著。

关 键 词：2A97 Al-Li alloy thermo-mechanical treatment pre-stretch deformation microstructure mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]