Influence of Sb on As-cast Microstructure of Au-Ge Eutectic Alloy

Liu Shengfa; Tan Guanghua; Xiong Jieran; Tong Hao; Huang Shangyu

doi:10.15980/j.tzzz.2016.08.001

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Influence of Sb on As-cast Microstructure of Au-Ge Eutectic Alloy
Vol. 36, Issue 8, Pages: 785-787(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.08.001

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[1]刘生发,谭广华,熊杰然,童浩,黄尚宇.Sb对Au-Ge共晶合金铸态组织的影响[J].特种铸造及有色合金,2016,36(08):785-787.

Liu Shengfa, Tan Guanghua, Xiong Jieran, et al. Influence of Sb on As-cast Microstructure of Au-Ge Eutectic Alloy. [J]. Special Casting & Nonferrous Alloys 36(8):785-787(2016)
[1]刘生发,谭广华,熊杰然,童浩,黄尚宇.Sb对Au-Ge共晶合金铸态组织的影响[J].特种铸造及有色合金,2016,36(08):785-787. DOI： 10.15980/j.tzzz.2016.08.001.

Liu Shengfa, Tan Guanghua, Xiong Jieran, et al. Influence of Sb on As-cast Microstructure of Au-Ge Eutectic Alloy. [J]. Special Casting & Nonferrous Alloys 36(8):785-787(2016) DOI： 10.15980/j.tzzz.2016.08.001.

摘要

利用光学显微镜和电子探针表征了Au-Ge共晶合金的显微组织

通过DSC测试了其熔化曲线和凝固曲线

研究了添加0.2%的Sb对Au-Ge共晶合金铸态组织的影响。结果表明

添加0.2%的Sb后

Au-Ge共晶合金的初生α-Au相由针状或长杆状变为树枝状或花瓣状

其尺寸明显变小。同时

共晶组织中颗粒状的共晶Ge相的尺寸减小。初生α-Au相及共晶Ge相的细化机理分别归结为元素Sb引起的成分过冷及共晶过冷度增大。

Abstract

The microstructure of Au-Ge eutectic alloy was characterized using optical microscope and electron probe micro-analyser

and its melting and solidification curves were tested by DSC in order to understand effects of 0.2% Sb addition on as-cast microstructure of Au-Ge eutectic alloy.The results show that primaryα-Au phase morphologies in Au-Ge eutectic alloy are converted from long rod/needle into petal/dendrite with 0.2% Sb addition

and its size is refined significantly.Meanwhile

the size of granular eutectic Ge phase is reduced remarkably.The refinement mechanism of primaryα-Au phase and Ge phase is attributed to constitutional supercooling and eutectic undercooling degree increase caused by the element Sb

respectively.