Mg-7Sn-Zn(Y)合金的显微组织、时效硬化行为及力学性能

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (6): 1-8.

• 材料科学与工程 • 下一篇

Mg-7Sn-Zn(Y)合金的显微组织、时效硬化行为及力学性能

毕广利¹, 徐作成¹, 顾家睿¹, 姜静¹, 蒋春宏², 李元东¹

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.兰石铸造有限公司, 甘肃兰州 730050

收稿日期:2020-05-09 出版日期:2020-12-28 发布日期:2021-01-07
作者简介:毕广利(1981-),男,吉林磐石人,副教授
基金资助:
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)

Microstructure, age-hardening behavior and mechanical properties of Mg-7Sn-Zn(Y) alloy

BI Guang-li¹, XU Zuo-cheng¹, GU Jia-rui¹, JIANG Jing¹, JIANG Chun-hong², LI Yuan-dong¹

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Lanshi Foundry Co., Ltd., Lanzhou 730050, China

Received:2020-05-09 Online:2020-12-28 Published:2021-01-07

摘要/Abstract

摘要： 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+Mg₂Sn)相组成.Zn添加细化了Mg₂Sn相的尺寸,促进了Mg₂Sn相大量、均匀的弥散分布,同时诱导了Mg₂Sn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Mg₂Sn相的析出强化.

关键词: Mg-Sn-Zn-Y合金, 显微组织, 时效硬化行为, 力学性能

Abstract: The microstructure, age-hardening behavior and mechanical properties of Mg-7Sn-Zn(Y) alloy were investigated. The as-cast Mg-7Sn alloy was mainly composed of α-Mg and eutectic(α-Mg+Mg₂Sn) phase. The addition of Zn refines Mg₂Sn phase, increases volume fraction of Mg₂Sn phase and promotes precipitation of Mg₂Sn phase on non-basal plane, and thus enhances the ageing hardening capacity of the alloy. The peak-ageing hardness of the Mg-7Sn-1Zn 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-7Sn-1Zn alloy exhibits the best mechanical properties,Which was mainly attributed to the precipitation strengthening of fine Mg₂Sn phasewith high volume fraction.

Key words: Mg-Sn-Zn-Y alloy, microstructure, age-hardening behavior, mechanical properties

中图分类号:

TG146.2

毕广利, 徐作成, 顾家睿, 姜静, 蒋春宏, 李元东. Mg-7Sn-Zn(Y)合金的显微组织、时效硬化行为及力学性能[J]. 兰州理工大学学报, 2020, 46(6): 1-8.

BI Guang-li, XU Zuo-cheng, GU Jia-rui, JIANG Jing, JIANG Chun-hong, LI Yuan-dong. Microstructure, age-hardening behavior and mechanical properties of Mg-7Sn-Zn(Y) alloy[J]. Journal of Lanzhou University of Technology, 2020, 46(6): 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

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