首页|Cr含量对时效态Cu?Cr?P合金显微组织和性能的影响

Cr含量对时效态Cu?Cr?P合金显微组织和性能的影响

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研究Cr含量对时效态Cu−Cr−P合金析出相和性能的影响.结果发现,时效处理后Cu−Cr−P合金中存在3种尺寸的Cr相,其中,纳米级Cr相是Cu−Cr−P合金的主要强化相;≤5 nm的Cr相为面心立方结构,与基体完全共格,强化机制为位错切过机制,强化效果约为200 MPa;10～20 nm的Cr相为与基体非共格的体心立方结构,其强化机制为Orowan位错绕过机制,强化效果约为100 MPa.Cr元素含量的改变使得两种纳米级Cr析出相的数量与尺寸发生变化,进而导致Cu−Cr−P合金的力学性能呈现出先增加后减小的趋势.Cu−0.36Cr−0.01P合金经980°C保温2 h固溶处理→95％冷轧→450°C保温1 h时效处理后,具有较好的综合性能:抗拉强度572 MPa和导电率80.0％IACS.
Effect of Cr content on microstructure and properties of aged Cu−Cr−P alloys
The role of Cr in affecting the precipitates and the properties of aged Cu−Cr−P alloys was investigated and discussed. The results show that there are mainly three sizes of Cr phase in aged Cu−Cr−P alloys, among them, the nano-sized Cr phase plays an important role in the strength of Cu−Cr−P alloys. The strengthening effect of Cr phase (less than 5 nm) with FCC structure completely coherent with the matrix is calculated to be about 200 MPa on the basis of dislocation cut-through mechanism. The strengthening effect of Cr phase (10−20 nm) with BCC structure incoherent with the matrix is calculated to be about 100 MPa on the basis of the Orowan dislocation bypass mechanism. The increase of Cr content changes the number and size of nano-sized Cr phase, which causes the mechanical properties of the Cu−Cr−P alloys to increase first and then decrease. The tensile strength of Cu−0.36Cr−0.01P alloy is 572 MPa and its electrical conductivity is 80％ IACS after solid solution treatment at 980 °C for 2 h followed by 95％ cold rolling and then aging treatment at 450 °C for 1 h.

Cu−Cr−P alloyCr contentmultiscale precipitates

王健、张洪涛、付华栋、谢建新

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北京科技大学现代交通金属材料与加工技术北京实验室,北京 100083

北京科技大学材料先进制备技术教育部重点实验室,北京 100083

Cu−Cr−P合金 Cr元素含量 多尺度析出相

authors are grateful for the financial supports from National Key R&D Program of ChinaBeijing Nova Program, ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2016YFB0301303Z19110000111912551974028U1602271

2021

10.1016/S1003-6326(20)65490-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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