Excellent combination of mechanical properties and electrical conductivity obtained by minute addition of alloying elements and nanometer scaled Al2O3 in copper alloy
Excellent combination of mechanical properties and electrical conductivity obtained by minute addition of alloying elements and nanometer scaled Al2O3 in copper alloy
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DOI：
10.1016/j.msea.2023.144689
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发表时间：
2023-02-04
期刊：
影响因子：
6.4
通讯作者：
Liu, Xinhua
中科院分区：
文献类型：
--
作者：
Liu, Feixiang;Xie, Guoliang;Liu, Xinhua
通过微量添加合金元素（相当于0.75wt%Ni和0.20wt%Si）和纳米Al 2 O3颗粒，获得了硬度为184.4 HV、屈服强度为573 MPa、抗拉强度为607 MPa、电导率为54.9%IACS的上级综合性能。利用扫描电子显微镜（SEM）、背散射电子衍射（EBSD）和透射电子显微镜（TEM）研究了这些Al 2 O3颗粒对析出过程和强化行为的影响。结果表明，纳米Al 2 O3颗粒的加入可使合金在冷变形及随后的时效过程中位错密度增加，晶粒细化。由于位错、亚晶界和晶界以及Al 2 O3颗粒周围的异质形核，从而促进了沉淀动力学，从而改善了沉淀的分布和细化。析出相的体积分数和数量密度增加，导致在Cu-Ni-Si-Al 2 O 3合金的机械和电气性能的同时提高。该研究通过对沉淀强化和弥散强化的介绍，为沉淀硬化铜合金的设计提供了有意义的指导。
A superior comprehensive property of Cu-Ni-Si-Al2O3 alloy, including microhardness of 184.4 HV, yield strength of 573 MPa, tensile strength of 607 MPa, and excellent electrical conductivity of 54.9 %IACS, is obtained with the minute addition of alloying elements (similar to 0.75 wt% Ni and similar to 0.20 wt% Si) and nanometer scaled Al2O3 particles. The influence of these Al2O3 particles on the precipitation process and strengthening behaviors has been investigated by the scanning electron microscopy (SEM) equipped with electron-backscattered diffraction (EBSD) and transmission electron microscope (TEM). The results show that the addition of nanometer scaled Al2O3 particles can cause the increase of dislocation density and refinement of the grains during cold deformation and the following aging process. The precipitation kinetics are consequently promoted due to heterogeneous nucleation around the dislocations, sub-grain and grain boundaries and the Al2O3 particles, resulting in the improvement in distribution and refinement of precipitation. The volume fraction and number density of the precipitates are increased, resulting in the simultaneous enhancement of mechanical and electrical properties in the Cu-Ni-Si-Al2O3 alloy. This study provides a significant guidance for the design of precipitation hardening copper alloy, by introducing the precipitation strengthening and dispersion strengthening.