Cu对Mg-7Zn-0.6Zr合金流动性的影响

doi:10.11901/1005.3093.2018.352

材料研究学报

2018, Vol. 32

Issue (9): 697-705 DOI: 10.11901/1005.3093.2018.352

本期目录 | 过刊浏览

Cu对Mg-7Zn-0.6Zr合金流动性的影响

周野, 毛萍莉(

), 杨博莘, 王志, 周乐, 刘正, 王峰

沈阳工业大学材料科学与工程学院沈阳 110870

Effect of Cu Content on Fluidity of Mg-7Zn-0.6Zr Alloys

Ye ZHOU, Pingli MAO(

), Boshen YANG, Zhi WANG, Le ZHOU, Zheng LIU, Feng WANG

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

引用本文:

周野, 毛萍莉, 杨博莘, 王志, 周乐, 刘正, 王峰. Cu对Mg-7Zn-0.6Zr合金流动性的影响[J]. 材料研究学报, 2018, 32(9): 697-705.
Ye ZHOU, Pingli MAO, Boshen YANG, Zhi WANG, Le ZHOU, Zheng LIU, Feng WANG. Effect of Cu Content on Fluidity of Mg-7Zn-0.6Zr Alloys[J]. Chinese Journal of Materials Research, 2018, 32(9): 697-705.

全文: PDF(5849 KB) HTML

摘要:

使用流动性模具研究了Cu含量对Mg-7Zn-xCu-0.6Zr(x=0,1,2,3)合金流动性的影响。用双电偶差热分析法分析了合金凝固过程中的凝固区间和枝晶相干温度等参数,根据TEM鉴别了合金的微观物相,并结合SEM和EPMA观察了合金的显微组织。基于理论预测和流动性实验测试研究了Mg-7Zn-xCu-0.6Zr(x=0,1,2,3)合金的流动性。结果表明,随着Cu的加入在Mg-7Zn-0.6Zr合金中析出MgZnCu共晶组织,使晶粒细化、凝固区间减小、枝晶相干温度降低、枝晶生长速率降低和合金流动性提高。

关键词 ：金属材料, Mg-Zn-Cu-Zr合金, 凝固行为, 流动性, 枝晶生长速率

Abstract：

Mg-Zn-Cu ternary alloys were draw much attention in recent years for its good high temperature performance. However, the fluidity plays a key role in the castability of Mg alloys. Therefore, the hot tearing susceptibility of Mg-7Zn-xCu-0.6Zr (x=0,1,2,3) alloys was investigated by means of a home-made mould for casting fluidity measurement and cooling curve thermal analysis. The microstructure and phase constituents of Mg-7Zn-xCu-0.6Zr (x=0,1,2,3) alloys were characterized by means of TEM, SEM,EDS and EPMA. Results show that with the increasing of Cu content, the dendrite coherence temperature (T_coh) and the solidification interval decreased, while the grain size was refined. With the addition of Cu a new low-melt eutectic phase formed, and the fluidity of Mg-7Zn-xCu-0.6Zr (x=0,1,2,3) were improved.

Key words： metallic materials Mg-Zn-Cu-Zr alloys solidification behaviors fluidity dendrite growth rate

收稿日期: 2018-01-16

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51504153,51571145,51404137),辽宁省博士科研启动基金指导计划(20170520033),沈阳市国际合作项目(17-9-6-00),辽宁省自然科学基金(201602548)

作者简介:

作者简介周野,男,1992年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.352 或 https://www.cjmr.org/CN/Y2018/V32/I9/697

表1 Mg-7Zn-xCu-0.6Zr(x=0,1,2,3)合金的化学成分

图1 流动性测试模具的示意图和实物图

图2 差热分析法实验系统装置

图3 Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3)合金中心热电偶分析曲线

图4 Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3)合金凝固区间△TS

表2 Mg-7Zn-xCu-0.6Zr(x=0,1,2,3)合金液相线、固相线和凝固区间

图5 枝晶相干温度曲线

图6 Mg-7Zn-xCu-0.6Zr (x=0,1,2,3)合金的流动式样长度

图7 Mg-7Zn-xCu-0.6Zr (x=0,1,2,3)合金的SEM显微组织形貌

图8 Mg-7Zn-1Cu-0.6Zr合金晶界处共晶组织TEM形貌和MgZnCu、MgZn2相的电子衍射花样

表3 Mg-7Zn-xCu-0.6Zr (x=0,1,2,3)合金的EDS分析结果

图9 Mg-7Zn-3Cu-0.6Zr合金的EPMA分析

图10 Mg-7Zn-xCu-0.6Zr (x=0,1,2,3)合金的晶粒尺寸和枝晶生长速率

图11 Mg-7Zn-xCu-0.6Zr (x=0,1,2,3)合金停止流动机理示意图

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