Tuning Low Cycle Fatigue Properties of Cu-Be-Co-Ni Alloy by Precipitation Design
Tuning Low Cycle Fatigue Properties of Cu-Be-Co-Ni Alloy by Precipitation Design
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通过沉淀设计调节 Cu-Be-Co-Ni 合金的低周疲劳性能
DOI：
10.3390/met8060444
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发表时间：
2018-06
期刊：
影响因子：
2.9
通讯作者：
Zhao Longzhi
中科院分区：
文献类型：
--
作者：
Tang Yanchuan;Kang Yonglin;Liu Dejia;Shen Mingxue;Hu Yong;Zhao Longzhi
Cu-Be-Co-Ni合金作为航空航天领域的关键零部件材料，在服役过程中会发生循环塑性变形，从而导致低周疲劳失效。低周疲劳行为与合金的析出状态密切相关，但具体的相关性尚不清楚。为合理调控合金在不同服役条件下的低周疲劳性能，研究了不同析出状态对合金低周疲劳性能的影响。结果表明，在低应变幅下，完全由非剪切γ′相组成的合金具有较高的抗疲劳裂纹萌生能力，从而获得较长的疲劳寿命。具有细小可剪切γ′I相的合金具有较高的疲劳裂纹扩展抗力，在高应变幅下具有较长的疲劳寿命。合金的循环应力响应行为取决于随动硬化和各向同性软化之间的竞争。细小的可剪切γ′I相阻碍了循环载荷下有效应力的降低，导致合金的循环硬化。本文的研究工作有助于在各种循环载荷条件下设计合理的合金析出状态，以保证合金的使用安全。
As material for key parts applied in the aerospace field, the Cu-Be-Co-Ni alloy sustains cyclic plastic deformation in service, resulting in the low cycle fatigue (LCF) failure. The LCF behaviors are closely related to the precipitation states of the alloy, but the specific relevance is still unknown. To provide reasonable regulation of the LCF properties for various service conditions, the effect of precipitation states on the LCF behaviors of the alloy was investigated. It is found that the alloy composed fully of non-shearable γ′ precipitates has higher fatigue crack initiation resistance, resulting in a longer fatigue life under LCF process with low total strain amplitude. The alloy with fine shearable γ′I precipitates presents higher fatigue crack propagation resistance, leading to a longer fatigue life under LCF process with high total strain amplitude. The cyclic stress response behavior of the alloy depends on the competition between the kinematic hardening and isotropic softening. The fine shearable γ′I precipitates retard the decrease of effective stress during cyclic loading, causing cyclic hardening of the alloy. The present work would help to design reasonable precipitation states of the alloy for various cyclic loading conditions to guarantee its safety in service.
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