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AZ91鎂合金擠壓過程中β相的動態(tài)析出及其對組織和拉伸性能的影響
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國家自然科學(xué)基金(50505026)和上海市自然科學(xué)基金（05ZR14075）項目資助


Dynamic Precipitation of β Phase during Extrusion Process and Its Effects on the Microstructures and Tensile Properties of AZ91 Magnesium Alloy
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    摘要:

    研究了AZ91鎂合金擠壓變形過程中β相的動態(tài)析出行為及其對合金組織和拉伸性能的影響。結(jié)果表明，AZ91鎂合金的力學(xué)性能在擠壓后顯著提高。合金在擠壓過程中有大量β相粒子動態(tài)析出，且析出特征與擠壓溫度、擠壓比等工藝參數(shù)密切相關(guān)。β相粒子的動態(tài)析出對合金拉伸性能的直接作用有限，主要通過影響動態(tài)再結(jié)晶而影響組織演變，并進而影響合金性能。通過控制工藝過程能夠有效調(diào)整β相粒子的析出，使合金力學(xué)性能得到進一步提升。

    Abstract:

    The dynamic precipitation of the β phase in AZ91 magnesium alloy during extrusion process and its effects on the microstructures and tensile properties of the alloy are studied. It is found that the mechanical properties are effectively improved by the extrusion process and the dynamic precipitation of the β phase occurs during the extrusion process. The characteristics of precipitation are influenced by the extrusion temperature and extrusion ratio. The dynamically precipitated β phase has a limited direct effect on the tensile properties. The effects of β phase on the tensile properties come from its influence on the microstructure evolution through the dynamic crystallization. The authors consider that the mechanical properties of AZ91 can be further improved by controlling the working processes to optimize the precipitation characteristics of the β phase.

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劉六法,丁漢林,丁文江. AZ91鎂合金擠壓過程中β相的動態(tài)析出及其對組織和拉伸性能的影響[J].稀有金屬材料與工程,2009,38(1):104~109.[Liu Liufa, Ding Hanlin, Ding Wenjiang. Dynamic Precipitation of β Phase during Extrusion Process and Its Effects on the Microstructures and Tensile Properties of AZ91 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2009,38(1):104~109.]
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  • 收稿日期:2008-01-11
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