摘要
研究了铸造WE43镁合金在水下搅拌摩擦加工(SFSP)过程中的微观组织演变,以及后续时效热处理对SFSP试样微观组织及力学性能的影响。结果表明,SFSP显著细化了铸造WE43镁合金的晶粒尺寸,同时也将粗大的第二相破碎成细小弥散的不规则状颗粒。SFSP后,由于微观组织的细化及均匀化,材料的强度和伸长率均得到大幅提升。经过后续时效热处理,由于β′′和β1相的大量析出,峰值时效试样的强度得到了进一步提高,伸长率则有所降低。断口形貌分析表明,SFSP试样的拉伸断裂模式更倾向于韧性断裂,而峰值时效试样的拉伸断裂模式为韧-脆混合断裂。
The as-cast WE43 alloy was subjected to submerged friction stir processing（SFSP）. The effects of aging treatment on the microstructural evolution and mechanical properties of SFSP specimens were investigated. The results show that the microstructure of the cast WE43 alloy is significantly refined and the mechanical properties are greatly enhanced by SFSP. After the subsequent artificial aging treatment at 150 °C for 66 h and 180 °C for 54 h, the strengths of the peak-aged specimens further increase, which is attributed to the large quantity of β′′ and β1 precipitates, respectively. Meanwhile, elongations of the peak-aged specimens are both decreased since more crack nucleation sites are provided with the increasing precipitates. The failure mechanism of SFSP specimen is ductile fracture, while that of the peak-aged specimens is mixed ductile-brittle fracture.
作者
曹耿华
刘一雄
张大童
郑振兴
Cao Genghua1, Liu Yixiong1, Zhang Datong2, Zheng Zhenxing1(1. Guangdong Polytechnic Normal University, Guangzhou 510665, China;2. Guangdong Key Laboratory for Advanced Metallic Materials processing, South China University of Technology, Guangzhou 510641, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第10期3179-3184,共6页
Rare Metal Materials and Engineering
基金
广东省自然科学基金(2015A030312003
2015A030313668)
广东省金属新材料制备与成形重点实验室开放课题(GJ201602)
