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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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大晶粒单相Ni-48Al金属间化合物超塑性变形过程中的组织演化
, PP. 489-493
Keywords: Ni-48Al,金属间化合物,大晶粒
Abstract:
原始平均晶粒尺寸约为200？m的单相Ni-48Al金属间化合物在温度为1025？1100℃、应变速率为1.25×10-4？2.00×10-3s-1范围内呈现超塑性.在1100℃、应变速率为1.125×10-3s-1时,最大延伸率可达188.2%.金相分析表明,超塑性变形过程中晶粒明显细化；电子背散射衍射分析(EBSD)和透射电子显微术(TEM)观察表明,超塑变形过程中形成了大量亚晶界网络,且随变形量增大,亚晶界及小角晶界比例不断增加.亚晶界由位错墙和位错网络构成,不稳定的亚晶界在超塑性变形过程中不断吸收晶内滑移和攀移位错,亚晶界位错密度不断增加,取向差不断增大.伴随亚晶界的滑移和迁移及亚晶的转动,部分亚晶界转变为小角度晶界,并进而转变为大角度晶界,即在超塑性变形过程中发生了连续动态回复与再结晶(CDRR).
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