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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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微米尺度钼丝的力学性能及其尺寸效应
Keywords: 金属材料,钼丝,拉伸性能,疲劳断裂,尺寸效应
Abstract:
？对直径分别为125mm、140mm和160mm的钼丝(模型材料)进行拉伸实验和应力控制的拉-拉疲劳实验,研究了微米尺度体心立方结构的钼丝的力学性能及其尺寸效应。在扫描电镜下观察钼丝的拉伸断口和疲劳断口,分析了金属钼丝的拉伸和疲劳断裂行为。结果表明,微米尺度体心立方拉拔态钼丝的拉伸断裂强度和应力控制下的疲劳强度都随着钼丝直径的减小而下降。微米尺度钼丝的疲劳性能尺寸效应,来源于丝中径向方向的拉长晶粒数目不同。结果丝的直径越小钼丝对表面所萌生的疲劳裂纹或缺陷越敏感,疲劳扩展寿命越短。
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