High-cycle fatigue and fracture behaviours of Cu-Be alloy with a wide strength range

High-cycle fatigue and fracture behaviours of Cu-Be alloy with a wide strength range
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宽强度范围Cu-Be合金的高周疲劳和断裂行为

DOI:
10.1111/j.1460-2695.2012.01710.x
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发表时间:
2013-02
影响因子:
3.7
通讯作者:
Zhang, Z.F.
Zhang, Z.F.
中科院分区:
材料科学2区
文献类型:
--
作者:
Pang, J.C.;Li, S.X.;Zhang, Z.F.

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研究了不同处理后抗拉强度为500~1300 MPa的Cu-Be合金的高周疲劳和断裂行为。由于微观组织的变化,疲劳裂纹萌生、断口形貌、S-N曲线和疲劳强度表现出明显的差异。在较低强度水平下,部分疲劳裂纹源于缺陷;而在高强度水平下,所有疲劳裂纹均从解理面萌生。研究发现,仅考虑一种强化机制,随着抗拉强度的增加,疲劳比呈线性增加,疲劳强度呈二次方变化。最后总结了各种Cu-Be合金的疲劳强度。
The high-cycle fatigue and fracture behaviours of Cu-Be alloy with tensile strength ranging from 500 to 1300 MPa acquired by different treatments were studied. Fatigue crack initiation, fracture surface morphologies, S-N curves and fatigue strength show obvious differences due to the change of microstructure. At relatively low-strength level, some fatigue cracks originated from defects; while at high-strength level, all the fatigue cracks initiated from cleavage facets. It was found that the fatigue ratio increases linearly and fatigue strength changes quadratically with increasing tensile strength, only considering one strengthening mechanism. Finally, the fatigue strengths of various Cu-Be alloys were summarized.
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