Microstructure-dependent fatigue behavior of aged Cu-6Ni-1.5Si alloy with discontinuous/cellular precipitates
Microstructure-dependent fatigue behavior of aged Cu-6Ni-1.5Si alloy with discontinuous/cellular precipitates
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DOI：
10.1016/j.msea.2019.01.057
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发表时间：
2019-02-18
期刊：
影响因子：
6.4
通讯作者：
Lee, J.
中科院分区：
文献类型：
--
作者：
Goto, M.;Yamamoto, T.;Lee, J.
研究了时效硬化态Cu-6 Ni-1.5Si合金的显微组织对疲劳强度的影响。在500 ℃下进行时效0.5小时以沉淀盘形δ-Ni 2Si沉淀物（连续沉淀物），并在3 h下进行不连续沉淀纤维形稳定δ-Ni 2Si沉淀物以强化Cu基体。0.5 h时效试样的抗拉强度约为3 h时效试样的1.3倍，但电导率较差。尽管拉伸强度有相当大的差异，但在0.5 h和3 h老化样本之间观察到疲劳强度无显著差异。3 h老化试样具有上级导电性，而不牺牲0.5 h老化试样的疲劳强度。从疲劳裂纹的微观结构敏感性出发，讨论了具有连续析出相和不连续析出相的Cu-6 Ni-1.5Si合金高周疲劳强度的物理背景。
The effect of microstructure on the fatigue strength of age-hardened Cu-6Ni-1.5Si alloy was investigated in this study. The aging was conducted at 500 degrees C for 0.5 h for the precipitation of disk-shaped delta-Ni2Si precipitates (continuous precipitates) and 3 h for the discontinuous precipitation of fiber-shaped, stable delta-Ni2Si precipitates to strengthen the Cu matrix. The tensile strength of 0.5 h-aged specimens was about 1.3 times greater than that of the 3 h-aged counterparts, but with inferior electrical conductivity. Despite the considerable difference in tensile strength, no notable difference in fatigue strength was observed between 0.5 h- and 3 h-aged specimens. The 3 h-aged specimens had superior electrical conductivity without sacrificing fatigue strength of the 0.5 h-aged specimens. The physical background of high-cycle fatigue strength in Cu-6Ni-1.5Si alloys with continuous precipitates and discontinuous precipitates is discussed considering the microstructure-sensitive behavior of fatigue cracks.