α+β型钛合金变形过程中裂纹萌生及其损伤机理Crack initiation and damage mechanism of α + β titanium alloy in the process of deformation
徐铁伟,蒋一征,张丰收,冯勇,李金山
摘要(Abstract):
以Ti-6Al-3Mo-1.5Zr-0.3Si钛合金加工过程中的组织异常和开裂为基础,研究了α+β型钛合金在形变过程中裂纹的萌生及其扩展规律。通过对于合金中出现的"剪切带"设计有效的压缩实验,分析了该类型组织在后续变形过程中的演化过程,讨论了精锻变形、低速率压缩在α+β型钛合金的裂纹萌生及其扩展的演变机理。结果表明:锻造过程中裂纹从材料表面形核并以双滑移机制扩展,低速率压缩时裂纹从剪切带内开始萌生并以再生形核机制扩展;对比研究说明"剪切带"和"剧变区"有着本质区别,"剧变区"对材料的力学性能未造成直接影响,而"剪切带"却是裂纹萌生之处,或是已形成裂纹的尖端塑性区。
关键词(KeyWords): 裂纹萌生;裂纹扩展;损伤;剪切带
基金项目(Foundation):
作者(Author): 徐铁伟,蒋一征,张丰收,冯勇,李金山
DOI: 10.13289/j.issn.1009-6264.2015.01.012
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