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首页> 外文期刊>Materials Science and Engineering >Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys
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Microstructure, thermo-mechanical properties and Portevin-Le Chatelier effect in metastable β Ti-xMo alloys

机译：亚料βTi-XMO合金中的微观结构，热机械性能和Portevin-Le Chatelier效应

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摘要

The microstructure, mechanical properties and Portevin-Le Chatelier (PLC) effect in Ti-xMo alloys (x = 10, 12, 15 and 18 wt%), in the temperature range of 250-350 degrees C with strain rates from 10(-3) s(-1) to 10(-4) s(-1), are systematically investigated in tension by using transmission electron microscopy and Gleeble 3500 testing machine combined with a digital image correlation technique. Results show that Young modulus decreases with increasing Mo contents, which is related to a more stable beta phase matrix and a decrease of omega phase fraction. Moreover, the values of Young modulus and 0.2% offset yield strength at elevated temperature are higher than the ones at room temperature in all the Ti-xMo alloys, except the Ti-18Mo alloy which shows an opposite result. These macroscopic features are consistent with the omega phase precipitation in deformed Ti-xMo alloys, due to the combined effects of omega phase strengthening and temperature softening. Furthermore, the serration type transforms from A to A + B, then to B and eventually to C as increasing temperature and decreasing strain rate as well as Mo contents, which mainly depends on the spatial cohesion of PLC bands influenced by the intensity of omega precipitate-dislocation interactions. Finally, the peak value of maximum stress drop magnitude appears in Ti-12Mo alloy and increases with decreasing the strain rate, which is attributed to a stronger intensity of omega precipitate-dislocation interactions caused by reducing dislocations movement and providing a longer ageing time for the precipitation of omega phase particles. Besides, the average stress drop magnitude increases in Ti-18Mo alloy and decreases in the other compositions as increasing engineering strain, which is related to the variation of omega phase fraction.
机译：Ti-XMO合金（X = 10,12,15和18wt％）中的微观结构，机械性能和Portevin-Le Chatelier（PLC）效应，在250-350℃的温度范围内，其应变率从10（ - 3）S（-1）至10（-4）S（-1），通过使用透射电子显微镜和GHELEBLE 3500测试机与数字图像相关技术进行系统地进行张力。结果表明，随着MO含量的增加，杨氏模量减少，与更稳定的β相矩阵和ω相位级分的降低有关。此外，除了显示相反结果的Ti-18Mo合金之外，升高温度下较高的温度下较高的偏移量和0.2％偏置屈服强度的值高于所有Ti-XMO合金。由于Omega相位强化和温度软化的综合影响，这些宏观特征与变形的Ti-XMO合金中的ω相沉淀一致。此外，血液型从A到A + B变换，然后从A + B变换，最终以增加温度和降低应变率以及MO含量，这主要取决于受OMEGA沉淀强度影响的PLC带的空间凝聚力-DisLocation交互。最后，最大应力下降幅度的峰值出现在Ti-12MO合金中，随着通过减少脱位运动而导致的ω沉淀 - 位错相互作用的较强强度增加，随着ω沉淀的相互作用的更强强度增加。 ω相粒子的沉淀。此外，Ti-18Mo合金的平均应力下降幅度增加，并在其他组合物中减少作为增加的工程菌株，这与ω相级分的变化有关。

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