Microstructural evolution and mechanical properties of a new Al-Cu-Li-X alloy at different solution temperatures
Microstructural evolution and mechanical properties of a new Al-Cu-Li-X alloy at different solution temperatures作者机构：School of Materials Science and EngineeringCentral South UniversityChangsha 410083China Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China
出 版 物：《Rare Metals》 (稀有金属（英文版）)
年 卷 期：2021年第40卷第3期
页 面：635-642页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学]
主 题：Solution treatment Precipitates Microstructure Al-Cu-Li alloys
摘 要：The micros tructural evolution and mechanical properties of a new Al-3.8 Cu-1.2 Li-0.4 Mg-0.4 Zn-0.4 Ag-0.3 Mn-X alloy treated at different solution temperatures were *** grain size was measured in optical micrograph(OM).The residual particles and the major precipitates were identified by electron probe microanalysis(EPMA),scanning electron microscopy(SEM) and transmission electron microscope(TEM),*** results show that the peak strength appears at 530℃/1 h+T6(165℃/20 h) and the values are 566.2 MPa(tensile strength) and 538.2 MPa(yield strength) with the elongation of 6.5 %.The strength of the alloy increases rapidly with the amount of the precipitates T1 and θ’ increasing when the solution temperature is530℃.The increase in density of precipitates is resulted from the residual particles Al2 Cu,and particles enriched with Cu,Mg,Zr and Ag dissolve into matrix gradually with the solution temperature ***,the number of precipitates decreases and part of the grain boundary weakens with a further increase in solution temperature from 540 to 550℃,leading to a decline of strength.
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