Combination effects of Yb addition and cryogenic-rolling on microstructure and mechanical properties of LA141 alloy
Combination effects of Yb addition and cryogenic-rolling on microstructure and mechanical properties of LA141 alloy
复制标题
Yb添加和深冷轧制对LA141合金显微组织和力学性能的联合影响
DOI：
10.1016/j.msea.2020.139611
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发表时间：
2020-06-24
期刊：
影响因子：
6.4
通讯作者：
Zhang, Jinghuai
中科院分区：
文献类型：
--
作者：
Jin, Siyuan;Liu, Hongyu;Zhang, Jinghuai
研究了低温轧制LA 141-xYb（x = 0，0.1）合金的显微组织和力学性能。Yb的加入细化了合金的晶粒，并形成了细小的Al 3 Yb相。在低温轧制试样中可以观察到亚微米级的动态再结晶晶粒。Yb的加入抑制了低温轧制过程中的动态再结晶，细化了晶粒。结果，加工软化大大减少，强度显著增加。结果表明，Yb的加入使铸态和冷处理态合金的抗拉强度分别提高了14.5%和40.1%，达到197 MPa和241 MPa。这主要是由于细化、弥散分布的Al_3Yb细颗粒、高密度位错和层错的共同作用所致。
Microstructure and mechanical properties of cryogenic-rolled LA141-xYb (x = 0, 0.1) alloys were investigated. With the addition of Yb, the grains of the alloy are refined, and some fine Al3Yb phases are formed. The submicron scale dynamic recrystallized grains can be observed in the cryogenic rolled specimen. The addition of Yb inhibits the dynamic recrystallization and refines the grains during cryogenic rolling. As a result, the work softening is greatly reduced, and the strength is significantly increased. The results show that, due to the addition of Yb, the ultimate tensile strength of as-cast and CR-processed alloys is increased by 14.5% and 40.1%, respectively, reaching 197 MPa and 241 MPa. It is mainly caused by the combined effects of refinement, dispersive fine Al3Yb particles, high density dislocation and stack faults (SFs).