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首页> 外文期刊>Materials at High Temperatures >The effects of Mo content on microstructure and high temperature tensile behavior of Ti-6.5Al-2Sn-4Zr-xMo-2Nb-1W-0.2Si titanium alloys
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The effects of Mo content on microstructure and high temperature tensile behavior of Ti-6.5Al-2Sn-4Zr-xMo-2Nb-1W-0.2Si titanium alloys

机译:钼含量对Ti-6.5A-2SN-4ZR-XMO-2NB-0.2SI钛合金微观结构和高温拉伸行为的影响

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摘要

The microstructure and 650 degrees C tensile behavior of Ti-65Al-2Sn- 4Zr-xMo-2Nb-1W-02Si high temperature titanium alloys with different contents of Mo were systematically investigated. The results showed that Mo was mainly solubilised in beta phase, and the concentration of Mo in alpha phase was much less than Nb. Microstructure observations indicated an obvious reduction in the size of transformed beta structure (beta(t)), primary phase (alpha(p)) and the thickness of secondary lamellar phase (alpha(L)), with the increase of Mo addition. It was also observed that adding more Mo could improve ultimate tensile strength and elongation (EL) at 650 degrees C, but reduce the yield strength (YS). Deformation behaviors of the alloys with different contents of Mo were researched by the analysis of respective dislocation morphologies. Compared to the 2% Mo alloy, the 4% Mo alloy had more beta phase, smaller alpha(p) and finer alpha(L), which could activate more dislocation slip systems and cross slip due to their excellent accommodative deformation capabilities during 650 degrees C tensile deformation process.
机译:系统研究了TI-65A-2SN-4ZR-XMO-2NB-1W-02SI高温钛合金的微观结构和650℃拉伸行为。结果表明,MO主要溶解于β相中,α相中的Mo浓度远小于Nb。微观结构观察表明转化的β结构(β(T)),伯阶段(α(α(α))和二次层层相的厚度(α(1))的尺寸的明显降低,随着MO添加的增加。还观察到添加更多MO可以在650℃下改善最终拉伸强度和伸长率(EL),而是降低屈服强度(ys)。各自错位形态的分析研究了MO不同含量的合金的变形行为。与2%钼合金相比,4%钼合金具有更多的β相,较小的α(P)和更精细的α(L),其可以在650度期间激活更多的位错滑滑系统和交叉滑移C拉伸变形过程。

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