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Article

The Microstructure and Mechanical Properties of Cu-20Ni-20Mn Alloy Fabricated by a Compact Preparation Process

by 1,2, 1,2, 3,*, 3, 1,2 and 1,2,*
1
Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China
3
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(11), 1528; https://doi.org/10.3390/met10111528
Received: 27 October 2020 / Revised: 11 November 2020 / Accepted: 15 November 2020 / Published: 18 November 2020
A novel compact preparation process has been developed to produce a Cu-20Ni-20Mn alloy. This process involves heating-cooling combined mould (HCCM) continuous casting, a solution treatment at 800 °C, rolling at room temperature and a final ageing step at 450 °C. This process eliminates two hot deformation processes, namely, hot forging and hot rolling, greatly improving production efficiency and reducing production costs compared with the traditional preparation process. The alloy fabricated by this process was found to have excellent mechanical properties. Additionally, the formation of precipitated phases during the ageing step is accelerated by this new process. The hardness of the samples reaches 476 HV after ageing for 10 h. Stable, ordered precipitates of Ni3Mn(L12 phase) are observed in the rolled specimen, and the orientation relationship between the copper matrix and ordered Ni3Mn phase (L12 phase) is [200]Cu//[010]Ni3Mn and [011]Cu//[011]Ni3Mn. Precipitation strengthening is the main reason for the increase of strength of the sample during the ageing process. The mechanical properties and ageing precipitation process of the alloy are affected by the rolling process. The precipitation rate of the rolled sample is greatly increased during the ageing process, leading to a larger amount of precipitates. View Full-Text
Keywords: Cu-20Ni-20Mn alloy; compact preparation process; mechanical properties; microstructure evolution; combined ageing process Cu-20Ni-20Mn alloy; compact preparation process; mechanical properties; microstructure evolution; combined ageing process
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MDPI and ACS Style

Wang, R.; Fu, Y.; Xie, G.; Hao, Z.; Zhang, S.; Liu, X. The Microstructure and Mechanical Properties of Cu-20Ni-20Mn Alloy Fabricated by a Compact Preparation Process. Metals 2020, 10, 1528. https://doi.org/10.3390/met10111528

AMA Style

Wang R, Fu Y, Xie G, Hao Z, Zhang S, Liu X. The Microstructure and Mechanical Properties of Cu-20Ni-20Mn Alloy Fabricated by a Compact Preparation Process. Metals. 2020; 10(11):1528. https://doi.org/10.3390/met10111528

Chicago/Turabian Style

Wang, Rui, Yilei Fu, Guoliang Xie, Zifan Hao, Shuai Zhang, and Xinhua Liu. 2020. "The Microstructure and Mechanical Properties of Cu-20Ni-20Mn Alloy Fabricated by a Compact Preparation Process" Metals 10, no. 11: 1528. https://doi.org/10.3390/met10111528

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