Effect of aging treatment on microstructure and mechanical properties of Mn-10Cu-4Cr alloy

doi:10.13251/j.issn.0254-6051.2024.10.029

Abstract

Abstract: Microstructure evolution and mechanical properties of Mn-10Cu-4Cr alloy after solution treatment at 850 ℃ for 40 min and aging at 400-600 ℃ for 8 h and at 440 ℃ for 0-120 h were studied. The results show that the matrix of the alloy after solution treatment shows stripe morphology with width of about 1.5 nm under TEM, and there is a copper-rich region without stripe morphology, indicating that the occurrence of spinodal decomposition leads to the inhomogeneity of alloy composition. Moreover, there is also α-Mn precipitated phase in the microstructure. With the increase of aging temperature and the extension of aging time, the grain size of the alloy changes little, while the hardness and strength increase significantly and the elongation decreases, which is due to the formation, growth and coarsening of Cu-rich nanoparticles, and the formation of the α-Mn phase within and between grains caused by aging treatment.

Key words: Mn-10Cu-4Cr alloy, microstructure, mechanical properties

CLC Number:

TG132

Wang Wenlong, Sun Liying, Liu Shuo, Long Danfeng, Zhang Huawei, Yin Fuxing. Effect of aging treatment on microstructure and mechanical properties of Mn-10Cu-4Cr alloy[J]. Heat Treatment of Metals, 2024, 49(10): 175-178.

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