Acta Metall Sin  1988, Vol. 24 Issue (5): 317-324    DOI:

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EFFECT OF AGING ON INTERNAL FRICTION, ELASTIC MODULUS AND MECHANICAL PROPERTIES OF TERNARY Mn-Cu-Al ALLOYS

YI Huchun;GE Tingsui (T. S. Ke) Institute of Solid State Physics; Academia Sinica. Hefei

YI Huchun;GE Tingsui (T. S. Ke) Institute of Solid State Physics; Academia Sinica. Hefei. EFFECT OF AGING ON INTERNAL FRICTION, ELASTIC MODULUS AND MECHANICAL PROPERTIES OF TERNARY Mn-Cu-Al ALLOYS. Acta Metall Sin, 1988, 24(5): 317-324.

Abstract References Related Articles Recommended Metrics Download:  PDF(713KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Internal friction and elastic modulus of ternary Mn-Cu-Al alloys con-taining 56--60 wt-% Mn, 0--3.59wt-% Al were measured with acoustic frequency, 1kHz, in the temperature range of -150 to 150℃. It was found that when the spe-cimen was aged in the temperature range under the spinodal curve within the mis-cibility gap, the internal friction increases with an increase of the aging time andreaches a maximum value at a certain aging time which is shorter with a higheraging temperature. Two internal friction peaks which did not appear before theaging were observed above room temperature after a definite aging time. These arethe martensite transformation peak and the relaxation peak originating from thestress-induced movement of the twin boundaries. The former peak shifts towardhigher temperatures with an increase of the aging time, whereas the relaxationpeak appearing at 15℃, is independent of the aging time and temperature. The ac-tivation energy associated with the relaxation peak was found to be 0.56 eV whichis about the same as that of the relaxation peak in binary alloy containing 90wt-% Mn. It was also found that the hardness, strength and the brittleness of thespecimen increase when aged below the spinodal curve within the miscibility gap.The addition of Al enhances the strength but reduces the internal friction of thespecimen. A choice of suitable aging time and temperature can give an optimum com-promise of high strength and high internal friction. Analysis of experimental re-sults suggests that spinodal decomposition leads to Mn-rich zones in the specimenand thus causes the phase transformation and the change of mechanical propertiesof the specimen. Key words:  internal friction      Mn-Cu-Al alloy      elastic modulus      mechanical properties      aging      Received:  18 May 1988      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1988/V24/I5/317 1 Butler E P, Kelly P M. Trans Metall Soc AIME, 1968; 242: 2099 2 Vitek J M, Warlimont H. Met Sci, 1976; 10: 7 3 Birchon D, Bromley D E, Healey D. Met Sci J, 1968; 2: 41 4 盛宗毅,私人消息 5 Sugimoto K. Mori T, Shiode S. Met Sci J, 1973; 7: 103 6 Vintaykin Ye Z, Dmitriyev V B, Udovenko V A. Phys Met Metallogr, (Eng. ed.), 1979: 44: 107 7 Smith J H, Vance E R. J Appl Phys, 1969; 40: 4853 8 Worrell F T. J Appl Phys, 1948; 19: 929 9 Zener C. Elasticity and Anelasticity of Metals, University Chicago Press, 1948: 160w [1] ZHANG Leilei, CHEN Jingyang, TANG Xin, XIAO Chengbo, ZHANG Mingjun, YANG Qing. 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