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| MARTENSITE MORPHOLOGY AND SHAPE MEMORY EFFECT OF A Cu-Al-Zn-Mn-Ni ALLOY |
| by ZHAO Liancheng; SUN Dungli; LEI Tingquan (Harbin Institute of Technology) (Manuscript received 22 June; 1982; revised manuscript 20 November; 1982) |
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Cite this article:
by ZHAO Liancheng; SUN Dungli; LEI Tingquan (Harbin Institute of Technology) (Manuscript received 22 June; 1982; revised manuscript 20 November; 1982). MARTENSITE MORPHOLOGY AND SHAPE MEMORY EFFECT OF A Cu-Al-Zn-Mn-Ni ALLOY. Acta Metall Sin, 1983, 19(4): 19-144.
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Abstract The martensite morphology and the shape memory effect of the Cu-10.10％ A1-4.51％Zn-3.76％Mn-0.39％Ni aUoy have been studied. It was shown that the martensite formed on cooling is of the spear type of self-accommodating configuration, but the stress-induced martensite is of the sheet type. These two morphologies are thermoelastic martensites having good shape memory effect. Experimental results indicate that the air-cooled and hot-rolled specimens have the best shape memory property with the maximum recovery ratio greater than 95％. Martensite obtained by rapid quenching has a slightly lower shape memory effect and a higher recovery temperature. Burst-type martensite occasionally appears when the specimen is cooled directly into liquid nitrogen. Preliminary energy dispersive spectrum analysis has shown that the Mn content of the burst type martensite is slightly lower than that of other morphologies.
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Received: 18 April 1983
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