快速凝固新型Au-Ag-Ge合金薄带的制备Preparation of rapidly solidified new-type Au-Ag-Ge alloy ribbon
崔大田,王志法
摘要(Abstract):
采用单辊快速凝固法制备了Au-19.25Ag-12.80Ge合金薄带。利用TEM方法对合金薄带的显微组织进行了观察分析,根据热传输平衡方程对快速凝固过程冷却速率进行估算。结果表明:辊面线速度在18~24 m/s范围内时,快速凝固冷却速率可达8.93×105~1.293×106K/s,随着快速凝固冷却速率的增加,合金薄带厚度有所减小;单辊快速凝固工艺的冷却速率对合金薄带的显微组织有重要影响,由于快速凝固工艺增加了材料的固溶度,减小了成分偏析,细化了晶粒,因此显微组织更加均匀细小,形成了纳米晶,快速冷却工艺在金属熔液内垂直于辊轮方向上产生的冷却速度梯度,造成了晶粒内部应力集中现象的产生。
关键词(KeyWords): 快速凝固;Au-Ag-Ge合金薄带;冷却速率;显微组织;应力集中
基金项目(Foundation): 国家高新工程重点项目
作者(Author): 崔大田,王志法
DOI: 10.13289/j.issn.1009-6264.2010.01.019
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