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α2相滑移系對(duì)全片層組織TiAl合金屈服應(yīng)力影響的初步分析
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TH142.2

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    摘要:

    基于PST晶體的微結(jié)構(gòu)和γ相及α2相普通位錯(cuò)和孿晶滑移啟動(dòng)，結(jié)合細(xì)觀力學(xué)方法，通過數(shù)值模擬兩相中的各滑移系上的分切應(yīng)力，得出PST晶體屈服應(yīng)力和外加載荷與片層之間夾角θ的關(guān)系。重點(diǎn)分析了α2相中柱面滑移系的啟動(dòng)對(duì)PST晶體屈服應(yīng)力大小變化的影響。α2相中柱面滑移系的啟動(dòng)對(duì)PST晶體小加載角方向的屈服應(yīng)力有比較明顯的影響。所采用的細(xì)觀方法和得到的結(jié)論對(duì)進(jìn)一步研究全片層TiAl合金的屈服強(qiáng)度有一定的參考價(jià)值。

    Abstract:

    Micromechanics theory is used to analyze the yield stress of polysynthetically twinning (PST) crystals of ?TiAl as a function of the loading angle between the lamellar and the loading axis. The numerical results of yield strength, based on considering the lamellar microstructure and the deformation mechanisms such as ordinary slip systems and true twinnings in PST crystals composed of and phase, is obtained by using calculating of resolved shear stresses in all slip systems based on micromechanical method. The emphasis was put on discussing the influence of prism slip systems in ? phase on the yield stress of polysynthetically twinning (PST) crystals of ?TiAl. The results indicates that the slip systems in ? phase have, to a certain extent, influences on the yield strength of PST crystals, especially at small angles ?directions.

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蘇繼龍 胡更開.α2相滑移系對(duì)全片層組織TiAl合金屈服應(yīng)力影響的初步分析[J].稀有金屬材料與工程,2004,33(8):808~810.[Su Jilong, Hu Gengkai.[J]. Rare Metal Materials and Engineering,2004,33(8):808~810.]
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  • 最后修改日期:2003-02-28
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