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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(英文),2017,46(10):3028~3032.[Yang Chubin,Luo Ning,Zhang Xiaolian and 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.]
Dendrite morphology and microstructure in directionalloy solidified Mg alloy with rare earth element Y
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Received:June 11, 2015  Revised:August 10, 2015
DOI:
Key words: directional solidification  Mg alloy  dendrite morphology  microstructure
Foundation item: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)
Author NameAffiliation
Yang Chubin,Luo Ning,Zhang Xiaolian and Han Baojun  
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Abstract:
      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%.
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