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金属学报  2017, Vol. 53 Issue (7): 851-860    DOI: 10.11900/0412.1961.2016.00476
  本期目录 | 过刊浏览 |
Mg-7Zn-xCu-0.6Zr合金热裂行为的研究
周野,毛萍莉(),王志,刘正,王峰
沈阳工业大学材料科学与工程学院 沈阳 110870
Investigations on Hot Tearing Behavior of Mg-7Zn-xCu-0.6Zr Alloys
Ye ZHOU,Pingli MAO(),Zhi WANG,Zheng LIU,Feng WANG
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
全文: PDF(4585 KB)   HTML
摘要: 

采用“T”型热裂模具研究了不同Cu含量对Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金热裂行为的影响。利用XRD和SEM对Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金进行了显微组织和热裂区域组织形貌观察。通过测量热裂纹体积表征了Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的热裂倾向性。实验结果表明,Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金中随着Cu含量的增加,晶粒得到细化,晶界上的共晶相增多,共晶相在凝固末期对分离的枝晶起到补缩的作用,降低合金热裂倾向性。研究表明,Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金微观裂纹的形成是液膜、凝固收缩补偿和晶间搭桥共同作用的结果。

关键词 Mg-Zn-Cu-Zr合金热裂行为凝固曲线微观组织    
Abstract

As one of the highest temperature magnesium alloys, Mg-Zn-Cu ternary alloys are draw much attention in recent years. However, the previous investigations were mainly focused on their microstructure and mechanical properties. The investigations on their solidification and hot tearing behaviors are barely discussed. In order to improve the industrial applications of Mg-Zn-Cu alloy, it is necessary to better understand the solidification pathways, phase constituent and hot tearing susceptibility (HTS) of these alloys. In this work, the effect of Cu additions on the hot tearing behaviors of Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3) alloys was studied using with T type hot tearing mold. The microstructure and the morphology of cracking zone of Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3) alloys were observed by XRD and SEM, respectively. The hot cracking susceptibility of Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3) alloys were characterized by the measurement of crack volume. The experimental results show that the grain sizes of Mg-7Zn-0.6Zr alloys were refined by addition of Cu element. Meanwhile, the amount of eutectic phase was increased with increasing the Cu content and the separated dendritic was refilled by the eutectic phase. Hot tearing susceptibility of Mg-7Zn-0.6Zr was decreased with increasing of Cu content. The Mg-7Zn-0.6Zr and Mg-7Zn-1Cu-0.6Zr alloys were completely broken. The hot cracks of Mg-7Zn-xCu-0.6Zr (x=0, 1, 2, 3) alloys were formed by liquid film, solidification shrinkage and interdendritic bridge.

Key wordsMg-Zn-Cu-Zr alloy    hot tearing behavior    solidification curve    microstructure
收稿日期: 2016-10-25      出版日期: 2017-04-26
基金资助:国家自然科学基金项目Nos.51504153和51571145,以及辽宁省教育厅科学技术研究一般项目No.L2015397

引用本文:

周野,毛萍莉,王志,刘正,王峰. Mg-7Zn-xCu-0.6Zr合金热裂行为的研究[J]. 金属学报, 2017, 53(7): 851-860.
Ye ZHOU,Pingli MAO,Zhi WANG,Zheng LIU,Feng WANG. Investigations on Hot Tearing Behavior of Mg-7Zn-xCu-0.6Zr Alloys. Acta Metall, 2017, 53(7): 851-860.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00476      或      http://www.ams.org.cn/CN/Y2017/V53/I7/851

图1  热裂行为测试装置示意图
图2  枝晶相干温度Tcoh和枝晶相干点固相分数fscoh图
Alloy Tcoh / ℃ fscoh
Mg-7Zn-0.6Zr 619.1 0.32
Mg-7Zn-1Cu-0.6Zr 610.6 0.39
Mg-7Zn-2Cu-0.6Zr 599.6 0.51
Mg-7Zn-3Cu-0.6Zr 598.9 0.57
表1  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的枝晶相干温度(Tcoh)和对应的固相分数(fscoh)
图3  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的热分析曲线
图4  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的XRD谱
Alloy α-Mg MgZnCu MgZn2
Mg-7Zn-0.6Zr 624.7 - 422.3
Mg-7Zn-1Cu-0.6Zr 620.1 529.5 432.6
Mg-7Zn-2Cu-0.6Zr 619.4 531.9 453.9
Mg-7Zn-3Cu-0.6Zr 616.9 532.5 457.4
表2  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的各种反应的反应温度
图5  200和250 ℃时Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的热裂裂纹形貌
图6  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的收缩力与温度曲线
图7  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金的OM像
图8  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金晶粒尺寸
图9  Mg-7Zn-xCu-0.6Zr (x=0、1、2、3)合金裂纹处断口SEM像
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