Effect of long period stacking ordered phase on damping capacities of as-cast Mg-Zn-Y alloys

LU Ruo-peng1, WANG Jing-feng2, DING Zhi-bing1, ZHAO Yu-hong1

（1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China； 2. School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China）

Abstract： The microstructure and damping capacities of MgZnxY1.33x (x=1-4 at.%) alloys were discussed and researched. The main phase composition of the alloys consists of α-Mg and long-period stacking ordered (LPSO) phase. Due to increased LPSO phase, grain size was refined. LPSO phase was advantageous to the damping properties of the Mg-Zn-Y alloys. Mg-7%Zn-12.8%Y has the highest damping capacity up to 0.04. Due to stacking fault probability, the LPSO phase in the Mg-Zn-Y alloys could be new damping source to dissipate energy so as to contribute to the improvement of damping capacities.

Key words： magnesium alloys; damping; microstructure； long period stacking ordered (LPSO) phase

CLD number： TG146.2Document code： A

Article ID： 1674-8042（2017）03-0283-06  doi： 10.3969/j.issn.1674-80422017-03-012

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长周期堆垛相对Mg-Zn-Y合金的阻尼性能影响

鲁若鹏1， 王敬丰2， 丁志兵1， 赵宇宏1

（1. 中北大学 材料科学与工程学院， 山西 太原 030051； 2. 重庆大学 材料科学与工程学院， 重庆 400044）

摘要:采用氩气保护条件下真空熔炼的方法熔炼出MgZnxY1.33x (x=1~4 at.%) 合金， 并运用SEM、 XRD及阻尼测试方法对合金的组织结构和阻尼性能进行分析和讨论。 结果表明， 合金中主要包含镁基体和长周期堆垛相， 随着Zn和Y含量的增加， 合金中晶粒逐步细化， 长周期堆垛相含量增多， 并且针状或带状的长周期堆垛相互穿插在一起。 阻尼测试的结果表明， 长周期堆垛相的增加有利于镁合金的阻尼性能， Mg-7%Zn-12.8%Y合金在高应变阶段阻尼最优， 其阻尼值达到0.04。

关键词:镁合金； 阻尼性能； 微观组织； 长周期堆垛相

引用格式：LU Ruo-peng, WANG Jing-feng, DING Zhi-bing, et al. Effect of long period stacking ordered phase on damping capacities of as-cast Mg-Zn-Y alloys. Journal of Measurement Science and Instrumentation, 2017, 8（3）： 283-288. ［doi： 10.3969／j.issn.1674-8042.20170312］

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