杨初斌,罗宁,张小联,韩宝军.定向凝固含Y镁合金的枝晶形态及微观组织研究[J].稀有金属材料与工程,2017,46(10):3028~3032.[Yang Chubin,Luo Ning,Zhang Xiaolian,Han Baojun.Dendrite morphology and microstructure in directionalloy solidified Mg alloy with rare earth element Y[J].Rare Metal Materials and Engineering,2017,46(10):3028~3032.]
定向凝固含Y镁合金的枝晶形态及微观组织研究
投稿时间:2015-06-11  修订日期:2015-08-10
中文关键词:  定向凝固  镁合金  枝晶形态  微观组织
基金项目:国家自然科学基金资助(项目号51464002),江西省科技落地计划项目(项目号KJLD13078)
中文摘要:
      采用液态金属冷却高温度梯度定向凝固炉制备了含稀土元素Y的镁合金,研究了定向凝固镁合金的枝晶形态及微观组织特征。结果表明,镁合金的一次枝晶沿着热流方向生长,且一次枝晶周围含有六个二次枝晶呈花瓣形状。通过扫描电镜及能谱分析发现,凝固组织中除了a(Mg)固溶体及枝晶间的?(Mg17Al12)相组成外,还存在稀土相。稀土相呈粗大的杆状和细小的粒状形态,主要由Y、Mg、Al和Mn元素组成,其中稀土Y的质量分数占22%左右。
Dendrite morphology and microstructure in directionalloy solidified Mg alloy with rare earth element Y
英文关键词:directional solidification  Mg alloy  dendrite morphology  microstructure
英文摘要:
      Directionally solidified Manesium alloys AZ91 with element Y were produced by using the liquid metal cooling Bridgman furnance. The dendrite morphology and microstructure of AZ91 were investigated in present paper. The results indicated that the primary dendrites of AZ91 grow along the direction of heat flow. The are six secondary dendrites which around the primary dendrite likes petal shape can be observed in cross section. The microstructure of AZ91 alloy is mainly composed of a matrix of primary a(Mg) solid solution and eutectic b(Mg17Al12) phase, and some Y-rich phase can be found with Y additions by using SEM and EDS. The RE-rich phases present coarse rod-like shape or tiny graininess. The Y, Mg, Al and Mn elements are found in RE-rich phase, and the mass fraction of rare earth element Y is about 22%.
作者单位E-mail
杨初斌 江西省镁合金工程研究中心 yangchubin831012@163.com 
罗宁 江西省镁合金工程研究中心  
张小联 江西省镁合金工程研究中心  
韩宝军 江西省镁合金工程研究中心  
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