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首页> 外文OA文献 >Microstructure and Mechanical Properties of a Forged $\beta$-solidifying $\gamma$ TiAl Alloy in Different Heat Treatment Conditions
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Microstructure and Mechanical Properties of a Forged $\beta$-solidifying $\gamma$ TiAl Alloy in Different Heat Treatment Conditions

机译：锻造的$β-凝固$γγTiAl合金在不同热处理条件下的组织和力学性能

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摘要

In the cast condition $\gamma$ titanium aluminide alloys that solidify completely through the $\beta$ phase are characterized by fine and homogeneous microstructures, weak textures and low segregation. For these reasons such alloys have a relatively good workability and can be closed-die forged without preceding ingot breakdown even if the alloys contain no large fractions of the $\beta$ phase at the working temperature. The present work was devoted to a combined study of the constitution and microstructural morphologies that develop in various two-step heat treatments of a single-step forged $\beta$ solidifying alloy. The study included high-energy X-ray diffraction for in situ investigations of the constitution at the heat treatment temperature. It was observed that the phase transformations are quite sluggish in the material which results in fine microstructures and some conditions that significantly deviate from thermodynamic equilibrium. Further, tensile and creep testing was carried out on the different material conditions in order to identify the range in which the properties can be varied. It is found that this easily forgeable material exhibits comparable strength, ductility and creep strength as more conventional peritectically solidifying alloys.
机译：在铸造状态下，完全通过$β相凝固的$γ铝化钛合金的特征是精细而均匀的微观结构，较弱的组织和低偏析。由于这些原因，即使这些合金在工作温度下不包含大部分的β相，也可以在不进行铸锭击穿的情况下进行相对较好的加工性并且可以进行闭模锻造。本工作致力于对单步锻造\β凝固合金的各种两步热处理进行开发的组织和微观结构形态的组合研究。该研究包括高能X射线衍射，用于在热处理温度下进行原位研究。观察到，材料中的相变相当缓慢，这导致了良好的微观结构和某些明显偏离热力学平衡的条件。此外，在不同的材料条件下进行了拉伸和蠕变测试，以便确定性能可以变化的范围。已经发现，这种易于锻造的材料表现出与更常规的蠕变固化合金相当的强度，延展性和蠕变强度。

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