采用单轴拉伸对LY12粗晶材料进行超塑性研究,温度一定时,在较高和较低的应变速率下都得到了大延伸率,而处于中间应变速率的试样延伸率较低.SEM断口分析表明,晶界上产生的粘性物质对粗晶超塑性行为有决定性影响.在高应变速率下,晶界上粘性层很薄,被粘性层包围着的晶粒和亚结构在相互挤压和相对转动中容易细化,有利于超塑性变形能力的提高且不易产生孔洞,室温性能良好;低应变速率下,大多晶界上都有粘性物质包围且粘性层厚度增大,粘性物质的增多使超塑性变形能力增强,但易产生孔洞,使室温性能恶化;而中间应变速率区间,晶粒细化程度不够,晶界上未产生较多粘性物质,有少量孔洞产生且变形能力较差.
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