INFLUENCE OF GRAIN SIZE AND ORDERING DEGREE OF PARENT PHASE ON M_s IN A Cu-Zn-Al ALLOY CONTAINING B

Acta Metall Sin

1989, Vol. 25

Issue (2): 22-28 DOI:

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INFLUENCE OF GRAIN SIZE AND ORDERING DEGREE OF PARENT PHASE ON M_s IN A Cu-Zn-Al ALLOY CONTAINING B

WU Jianxin;JIANG Bohong;XU Zuyao T. Y. Hsu Shanghai Jiaotong University

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WU Jianxin;JIANG Bohong;XU Zuyao T. Y. Hsu Shanghai Jiaotong University. INFLUENCE OF GRAIN SIZE AND ORDERING DEGREE OF PARENT PHASE ON M_s IN A Cu-Zn-Al ALLOY CONTAINING B. Acta Metall Sin, 1989, 25(2): 22-28.

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Abstract Based on the thermodynamics of phase transformation, a linear relation-ship between the starting temperature of martensitic transformation and the recipro-cal of the squareroot of grain size has been obtained, i. e. M_s temperature decreaseswith the increasing grain size. It shows a good agreement with the results of elec-tric resistance measurements. Application of Landau's theory gives a quantitative re-lationship between M_s temperature and the ordering parameter of the parent phase,which is well confirmed by the results of X-ray diffraction and electric resistancemeasurements. The activation energy of the DO_3 ordering process in the parent phaseof the alloy is calculated to be 46 kJ/mol.

Key words: Cu-ZD--Al alloy shape memory alloy thermoelastic martensite grain size ordering degree

Received: 18 February 1989

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