Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第6期    总第267期    2021年6月

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文章编号:1004-0609(2021)-06-1485-09
Ni、Si元素对Cu-Fe合金显微组织和力学性能的影响
岳世鹏,接金川,曲建平,李廷举

(大连理工大学 材料科学与工程学院,大连 116024)

摘 要: 利用光学显微镜、电子探针分析、透射电子显微镜、X射线衍射仪及拉伸实验等技术研究Ni、Si元素对Cu-20Fe(质量分数,%)合金的组织及力学性能的影响。结果表明:添加Ni和Si元素导致Cu-20Fe合金中α-Fe枝晶发生明显的粗化行为。此外,由于合金元素的添加使得γ-Fe和富铜析出相之间的界面能减小,从而使得富铜析出相的形貌发生显著变化,即由近球形转变为立方形。相比于未添加合金元素的二元合金而言,添加合金元素之后,多组元合金的强度和塑性均得到提高。多组元合金的屈服强度和伸长率分别为304 MPa和16%。通过理论计算和实验验证,确定合金的主要强化机制为固溶强化和析出强化。

 

关键字: 显微组织;形貌转变;界面能;强化机制

Effect of Ni and Si on microstructure and mechanical properties of Cu-Fe alloy
YUE Shi-peng, JIE Jin-chuan, QU Jian-ping, LI Ting-ju

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Abstract:The effects of Ni and Si elements on the microstructure and mechanical properties of Cu-20Fe (mass fraction, %) alloy were studied by optical microscope, electron probe analysis, transmission electron microscope, X-ray diffractometer and tensile experiment. The results show that the addition of Ni and Si elements leads to obvious coarsening behavior of the α-Fe dendrites in the Cu-20Fe alloy. In addition, due to the addition of alloying elements, the interface energy between γ-Fe and the copper-rich precipitation phase is reduced, so that the morphology of the copper-rich precipitation phase has undergone a significant change, that is, it changes from a nearly spherical shape to a cube. Compared with the binary alloy without adding alloying elements, the strength and plasticity of the multi-component alloy are improved after the addition of alloying elements. The yield strength and elongation of the multi-component alloy are 304MPa and 16%, respectively. Through theoretical calculation and experimental verification, it is determined that the main strengthening mechanism of the alloy is solid solution strengthening and precipitation strengthening.

 

Key words: microstructure; morphology transformation; interface energy; strengthening mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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