FRACTAL FRACTURE AND TRANSFORMATION TOUGHENING IN Cu-Ni-Al SINGLE CRYSTAL

Acta Metall Sin

1996, Vol. 32

Issue (11): 1165-1170 DOI:

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FRACTAL FRACTURE AND TRANSFORMATION TOUGHENING IN Cu-Ni-Al SINGLE CRYSTAL

LIN Guangming; TANG Zhenfang (Zhongshan University; Guangzhou 510275)

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LIN Guangming; TANG Zhenfang (Zhongshan University; Guangzhou 510275). FRACTAL FRACTURE AND TRANSFORMATION TOUGHENING IN Cu-Ni-Al SINGLE CRYSTAL. Acta Metall Sin, 1996, 32(11): 1165-1170.

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Abstract The fracture toughness KC and fractal dimension Df of fractured surfaces of Cu-Ni-Al single crystal have been measured at temperture range from 20℃to 120℃, in which thermoelastic martenstic transformation happened. The parent phase has higher KC than martensite phase due to stress induced transformation. The relationship between KC and Df has been studied especially and a linear relationship was found on semilog plot if failure mode is a simple mechanism. The slope of plot may be positive or negative for brittle or ductile failure respectively. The opposite relation can be understood by fracture micro-mechanism. Correspondent: LIN Guangming, professor, Department of Physics, Zhongshan University, Guangzhou 510275

Key words: Cu-Ni-Al single crystal fractal fracture toughness transformation toughening

Received: 18 November 1996

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1996/V32/I11/1165

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