兰州理工大学学报

2020, v.46;No.206(06) 1-8

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Mg-7Sn-Zn(Y)合金的显微组织、时效硬化行为及力学性能
Microstructure, age-hardening behavior and mechanical properties of Mg-7Sn-Zn(Y) alloy

毕广利;徐作成;顾家睿;姜静;蒋春宏;李元东;
BI Guang-li;XU Zuo-cheng;GU Jia-rui;JIANG Jing;JIANG Chun-hong;LI Yuan-dong;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ. of Tech.;Lanshi Foundry Co., Ltd.;

摘要(Abstract):

研究了Zn和Y合金化对Mg-7Sn合金显微组织、时效硬化行为和力学性能的影响.铸态Mg-7Sn合金主要由α-Mg和共晶(α-Mg+Mg_2Sn)相组成.Zn添加细化了Mg_2Sn相的尺寸,促进了Mg_2Sn相大量、均匀的弥散分布,同时诱导了Mg_2Sn相的非基面析出,增强了合金时效硬化效果.合金时效峰值硬度从64.6 HV增大到69.7 HV,峰值时效时间从166 h缩小至142 h.Zn和Y元素共同添加形成了针状MgSnY相,有效缩短了合金的时效峰值时间(由166 h缩短至120 h),但合金的峰值硬度略有降低,Mg-7Sn-1Zn合金具有最佳的力学性能,其高力学性能主要归结为细小、高体积分数Mg_2Sn相的析出强化.
The microstructure, age-hardening behavior and mechanical properties of Mg-7 Sn-Zn(Y) alloy were investigated. The as-cast Mg-7 Sn alloy was mainly composed of α-Mg and eutectic(α-Mg+Mg_2Sn) phase. The addition of Zn refines Mg_2Sn phase, increases volume fraction of Mg_2Sn phase and promotes precipitation of Mg_2Sn phase on non-basal plane, and thus enhances the ageing hardening capacity of the alloy. The peak-ageing hardness of the Mg-7 Sn-1 Zn alloy increases from 64.6 HV to 69.7 HV, and the peak-ageing time decreases from 166 h to 142 h. The addition of Zn and Y elements forms the needlelike MgSnY phase. Although the peak-ageing time of the alloy is effectively decreased(166 h to 120 h), the peak-ageing hardness of the alloy reduces. The Mg-7 Sn-1 Zn alloy exhibits the best mechanical properties, Which was mainly attributed to the precipitation strengthening of fine Mg_2Sn phase with high volume fraction.

关键词(KeyWords): Mg-Sn-Zn-Y合金;显微组织;时效硬化行为;力学性能
Mg-Sn-Zn-Y alloy;microstructure;age-hardening behavior;mechanical properties

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基金项目(Foundation): 国家自然科学基金(51961021);; 甘肃省自然科学基金(18JR3RA138);; 大学生创新创业计划(DC2018022,DC2019158,DC2019186)

作者(Author): 毕广利;徐作成;顾家睿;姜静;蒋春宏;李元东;
BI Guang-li;XU Zuo-cheng;GU Jia-rui;JIANG Jing;JIANG Chun-hong;LI Yuan-dong;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ. of Tech.;Lanshi Foundry Co., Ltd.;

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