首页|多道次搅拌摩擦加工Mg?3Zn?0.5Zr合金的显微组织演变与热拉伸行为

多道次搅拌摩擦加工Mg?3Zn?0.5Zr合金的显微组织演变与热拉伸行为

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系统研究单道次和多道次搅拌摩擦加工(FSP)后ZK30合金的显微组织和热拉伸行为.单道次搅拌摩擦加工(S-FSP)后,搅拌区(SZ)中的粗晶被细化至1~2μm,并呈现显著的基面织构.此外,第二相粒子发生碎裂、分散并部分溶解.多道次搅拌摩擦加工(M-FSP)提高了ZK30合金显微组织的均匀性,降低了搅拌区的织构强度差异,第二相粒子的比例降低了50%.在应变速率低于1×10−3 s−1和温度为250~350℃时S-FSP和M-FSP SZ均表现出超塑性.S-FSP SZ在250℃和1×10−4 s−1时的断裂伸长率为390%,而M-FSP SZ在350℃和1×10−3 s−1时的断裂伸长率为406%.对于S-FSP,SZ的超塑性变形主要由晶界滑移(GBS)和溶质拖曳机制协同作用,而对于M-FSP,GBS为其主要变形机制.
Microstructural evolution and hot tensile behavior of Mg?3Zn?0.5Zr alloy subjected to multi-pass friction stir processing
The microstructures and hot tensile behaviors of ZK30 alloys subjected to single-and multi-pass friction stir processing (FSP) were systematically investigated. Following single-pass FSP (S-FSP),coarse grains underwent refinement to 1−2 μm,with a distinct basal texture emerging in the stir zone (SZ). Additionally,second-phase particles were fragmented,dispersed,and partially dissolved. Multi-pass FSP (M-FSP) further enhanced the homogeneity of the microstructure,reduced texture intensity differences,and decreased the fraction of second-phase particles by 50%. Both S-FSP and M-FSP SZs demonstrated superplasticity at strain rates below 1×10−3 s−1 and at temperatures of 250−350 ℃. The S-FSP SZ exhibited an elongation of 390% at 250 ℃ and 1×10−4 s−1,while the M-FSP SZ achieved an elongation of 406% at 350 ℃ and 1×10−3 s−1. The superplastic deformation of SZ was co-dominated by grain boundary sliding (GBS) and the solute-drag mechanism in S-FSP and mainly by GBS in M-FSP.

ZK30 alloysmulti-pass friction stir processingsuperplasticitymicrostructurehot tensile behavior

王佶、付瑞东、胡天祥、李艺君、刘悦、朱志华、李世德、许哲峰

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燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛 066004

中信戴卡股份有限公司,秦皇岛 066004

燕山大学材料科学与工程学院,秦皇岛 066004

首都航天机械公司,北京 100076

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ZK30合金 多道次搅拌摩擦加工 超塑性 显微组织 热拉伸行为

2024

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子:1.183
ISSN:1003-6326
年,卷(期):2024.34(11)