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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.2; Jul 7-11, 2003; Leganes, Madrid, Spain >Superplasticity in Large-grained Intermetallics
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Superplasticity in Large-grained Intermetallics

机译：大晶粒金属间化合物的超塑性

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摘要

Superplastic behavior has been found in Fe_3Al, Fe_3Si, FeAl, Ni_3Al, NiAl and TiAl alloys with large grain sizes (>30-600μm). The large-grained intermetallic alloys exhibit all deformation characteristics of fine-grained superplastic alloys without the usual pre-requisites of a fine grain size and grain boundary sliding. Metallographic examination have shown that the average grain size of large-grained intermetallics decreased during superplastic deformation and a much finer grain size could be obtained after superplastic deformation. Transmission electron microscopy (TEM) and orientation image microscopy (OIM) observations have shown that there were great numbers of subgrain boundaries which formed a network and among which the proportion of low and high angle boundaries increased with the increase of strain. The observed superplastic phenomenon is explained by continuously dynamic recovery and recrystallization (CDRR).
机译：在具有大晶粒尺寸（>30-600μm）的Fe_3Al，Fe_3Si，FeAl，Ni_3Al，NiAl和TiAl合金中发现了超塑性行为。大晶粒金属间合金表现出细晶粒超塑性合金的所有变形特性，而没有通常的先决条件，即晶粒细小和晶界滑动。金相检查表明，在超塑性变形过程中，大晶粒金属间化合物的平均晶粒尺寸减小，而在超塑性变形之后，可以获得更细的晶粒尺寸。透射电子显微镜（TEM）和取向图像显微镜（OIM）的观察表明，存在大量的亚晶界，形成了一个网络，其中低，高角界的比例随着应变的增加而增加。观察到的超塑性现象是由连续动态恢复和重结晶（CDRR）解释的。

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