| 锌铝共析合金的超塑性变形组织特征 |
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| 引用本文： | 罗兵辉,周善初.锌铝共析合金的超塑性变形组织特征[J].中南大学学报(自然科学版),1996(4). |
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| 作者姓名： | 罗兵辉 周善初 |
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| 作者单位： | 中南工业大学材料科学与工程系 |
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| 基金项目： | 国家“八五”科技攻关计划基金 |
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| 摘 要： | 用电镜等手段对室温下超塑性变形中的Ｚｎ－２２％Ａｌ共析合金的组织变化进行了观察，发现在该合金的α相（富Ａｌ相）＋β相（富Ｚｎ相）２相组织中，在三叉晶界存在亚微观破坏区（破坏了晶粒间的连续性）和显微孔洞，在α，β晶界的某些区域存在条纹带，某些晶粒内部存在大量位错及其缠结．据此，证实该合金超塑性变形的主要机制是新晶粒挤入及晶界滑动．孔洞和位错运动松弛晶界活动引起的应力集中，能协调晶界滑动的连续进行．条纹带是晶界迁移的结果．
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| 关 键 词： | 超塑性变形 晶界滑移 孔洞 位错 |
STRUCTURAL CHARACTERISTICS OF THE SUPERPLASTIC MECHANISM OF Zn-22%Al EUTECTOID ALLOY |
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| Luo Binghui, Zhou Shanchu.STRUCTURAL CHARACTERISTICS OF THE SUPERPLASTIC MECHANISM OF Zn-22%Al EUTECTOID ALLOY[J].Journal of Central South University:Science and Technology,1996(4). |
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| Authors: | Luo Binghui Zhou Shanchu |
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| Abstract: | In this paper,the structure change of a superplastic Zn-22%Al eutectoid alloy at the room temperature has been investigated and discussed in terms of optical and electron microscopy. It is shown that microregions and microholes exist in the triple points of grain boundary. The striped bands exist in some grain boundaries and many dislocation within some grains. The main mechanism of superplastics is the grain squeezing and grain boundary sliding. The hole and movement of dislocations relax the stress concentration because of grain boundary sliding. The striped bands are the result of grain boundary sliding. |
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| Keywords: | superplastic deformation grain boundary sliding holes dislocation |
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