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OALib Journal期刊
ISSN: 2333-9721
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高低温熔体混合对Au-20Sn共晶合金凝固组织的影响
DOI: 10.3724/SP.J.1037.2012.00365, PP. 1387-1393
Keywords: 熔体混合,Au-20Sn共晶合金,凝固组织,初生相
Abstract:
研究了高低温熔体混合处理对Au-20Sn(质量分数,\)共晶合金凝固组织的影响,分析了Au-20Sn合金凝固组织随熔体混合处理中高温熔体温度变化(低温熔体温度均为283℃)的演变规律.结果表明,高低温熔体混合处理能有效改善合金凝固组织结构,采用适当的高温熔体(350℃)与低温熔体(283℃)进行熔体混合自然冷却凝固,会抑制初生相ζ'-Au5Sn的析出,得到细小全层片共晶组织.但当高温熔体温度偏高(360℃)或偏低(340℃)时,Au-20Sn共晶合金凝固组织中均存在初生相ζ'-Au5Sn.高低温熔体混合处理改善合金凝固组织的主要原因是降低了凝固过程中Au富集的偏析现象,改变了ζ'-Au5Sn相的结晶析出行为.在220℃热压缩变形过程中,熔体混合得到的细小全层片组织具有良好的热压缩变形能力,表现为具有较低的屈服应力和恒应力-应变平台.
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