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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >High strain torsion of a TiAl-based alloy
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High strain torsion of a TiAl-based alloy

机译：TiAl基合金的高应变扭转

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摘要

A two-phase lamellar and globular TiAl-based alloy (Ti-45AW(Cr, Nb, Ta, B)) with different textures has been deformed in torsion in a Paterson-type rock deformation machine at a temperature of 1173 K under 400 MPa argon confining pressure. The shear stress-shear strain curves with increasing shear strain show a decrease or increase of shear stress in the lamellar and globular case, respectively, to a common steady state value. Activation analysis at high strains yields stress exponents of about 1.8 and an activation energy of 3.29 eV. With increasing shear strain the lamellar structure breaks down and a two-phase fine-grained globular structure develops by recrystallization with a grain size in the order of 2 μm. The weak initial fibre textures at high strains are randomized. The mechanical, microstructural and textural features indicate a transition from dislocation creep to superplastic flow.
机译：具有不同织构的两相片状球状TiAl基合金（Ti-45AW（Cr，Nb，Ta，B））已在Paterson型岩石变形机中于1173 K的温度下在400 MPa下扭转变形氩气围压。随着剪切应变的增加，剪切应力-剪切应变曲线分别显示出在层状和球状情况下剪切应力的减小或增加，达到共同的稳态值。高应变下的活化分析得出的应力指数约为1.8，活化能为3.29 eV。随着剪切应变的增加，层状结构破裂，并且通过重结晶以晶粒尺寸为2μm的量级发展了两相细粒状球状结构。高应变时较弱的初始纤维质地是随机的。机械，微观结构和纹理特征表明从位错蠕变过渡到超塑性流。

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