Novel Mg-Al-Sn-Zn-Y Alloys with Enhanced Strength-Ductility Combination Prepared by Hard-Plate Rolling
Novel Mg-Al-Sn-Zn-Y Alloys with Enhanced Strength-Ductility Combination Prepared by Hard-Plate Rolling
复制标题
硬板轧制制备的新型强塑复合镁-铝锡-锌-钇合金
DOI：
10.1002/adem.202100419
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发表时间：
2021
影响因子：
3.6
通讯作者：
Wang Huiyuan Y.
中科院分区：
文献类型：
--
作者：
Zha Min;Liu Jinming M.;Jia Hailong L.;Li Debei B.;Li Yongkang K.;Wang Cheng;Song Jiawang W.;Ma Pinkui K.;Wang Huiyuan Y.
为此，采用硬板轧制技术开发了新型高性能镁铝锡锌Y(−XY)合金。随着Y的加入，HPRed ATZ821合金的异质晶组织变得更加均匀，并伴随着基面织构的显著减弱。这是由于Al_2Y颗粒的颗粒激发形核效应、弥散分布的亚微米级析出物的钉扎效应以及Y原子在 + -Mg中激活的~lt；cαa>；滑移引起的动态再结晶。相应地，HPRed ATZ821−1.0Y合金表现出良好的强塑性组合，即屈服强度(YS)为≈248 Mpa，极限拉伸强度(UTS)为≈385 Mpa，均匀延伸率(UE)为≈20%。YS偏高的主要原因是晶界强化，晶界强化占YS总量的≈的70%。UE高的主要原因是加工硬化较强，基体织构减弱，析出相弥散分布，Y原子在固溶体中引起的<；c + a>；滑移增强。
Herein, novel high‐performance Mg–Al–Sn–Zn–Y (ATZ821−xY) alloys are developed via hard‐plate rolling (HPR). With the addition of Y, the heterogeneous grain structure of the HPRed ATZ821 alloy evolves to be more uniform, accompanied with significant weakening in basal texture. This is due to the faster dynamic recrystallization (DRX) induced by the particle‐stimulated nucleation (PSN) effect from the Al2Y particles, pinning effect from well‐dispersed submicrometer‐sized precipitates including Mg17Al12and Mg2Sn, and the<c + a>slips activated by Y atoms in α‐Mg. Correspondingly, the HPRed ATZ821−1.0Y alloy shows a good combination of strength and ductility, that is, a yield strength (YS) of ≈248 MPa, an ultimate tensile strength (UTS) of ≈385 MPa, and a uniform elongation (UE) of ≈20%. The high YS is mainly due to grain boundary strengthening, which accounts for ≈70% of the total YS. The high UE is mainly attributed to the strong work hardening associated with weakened basal texture, well‐dispersed Mg17Al12and Mg2Sn precipitates, as well as enhanced<c + a>slips induced by Y atoms in the solid solution.