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Cu-Zn-Al合金中熱彈性馬氏體轉變理論

Theory for Thermoelastic Martensitic Transformation in A Cu-Zn-Al Alloy

  • 摘要: 把已建議的熱彈性馬氏體轉變唯象理論,應用到Cu-Zn-Al合金中,得到常規單位下的靜態自由能。將其與經典理論的相變自由能比較發現,在約20%—70%馬氏體的線性變化范圍,單位馬氏體轉變引起的界面能為常數,而引起的彈性能隨馬氏體量正比地增加。此外,上述唯象理論中的“摩擦準焓”和“摩擦準熵”,均分別化為常規的焓和熵的單位,更便于探討其物理意義。

     

    Abstract: The phenomenological theory for the thermoelastic martensitic transformation suggested by the authors before is applied for Cu-29% Zn-3% Al alloy. The free energy function as well as the friction quasi-enthalpy and friction quasi-entropy, are obtained in SI units. Comparing with the clastic theory, the free energy can be broken into three parts: the chemical free energy, the interfacial energy and the elastic strain energy. In the range of 20%-70% M in the alloy, the interfacial energy per unit martensite formation is constant and the elastic strain energy per unit martensite formation is a linear function of martensite percent.

     

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