首页> 外文会议>Symposium on Superplasticity-Current Status and Future Potential held November 29-December 1, 1999, Boston, Massachusetts, U.S.A. >Analysis of cavitatioln in a near- gammA titanium alumindie during high temperature/superplastic deformation
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Analysis of cavitatioln in a near- gammA titanium alumindie during high temperature/superplastic deformation

机译:高温/超塑性变形过程中近gammA钛铝模中空化现象的分析

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The superplastic flow behavior of a near- gamma titanium aluminide (Ti-45.5Al-2Cr-2Nb) is determined under uniaxial tension in as-rolled or rolled-and-heat treated conditions (1177 deg C/4 hr orr 1238 deg C/2 hr). Cavitation characteristics, including cavity grouwth rates, are established via isothermal, constain strain rate tests conducted at 10~(-4) to 10~(-2) s~(-1) and temperatures between 900 deg C and 1200 deg C. Differences in cavitation as a function of inital structure, strain, strain rate and temperature are noted. Cavity growth is found to be largely plasticity controlled. Experimental gwoth rates are compared with equations that predict rates as a function of strain rate sensitivity. although the equations assume no coalescence and no nucleation of new cavities, which are experimentally observed, they are useful in predicting actual grwoth rates.
机译:在轧制或轧制和热处理条件下(1177℃/ 4小时或1238℃/℃),在单轴张力下测定近γ铝化钛(Ti-45.5Al-2Cr-2Nb)的超塑性流动行为。 2小时)。通过在10〜(-4)到10〜(-2)s〜(-1)以及900摄氏度和1200摄氏度之间的温度下进行的等温,保持应变速率测试来建立空化特性,包括空洞熟化率。空化作用与初始结构的关系,应注意应变,应变速率和温度。发现型腔的增长很大程度上受可塑性控制。将实验速率与预测速率作为应变速率敏感性函数的方程式进行比较。尽管这些方程式假定没有聚结并且没有新腔的成核(通过实验观察到),但是它们在预测实际的生长速率方面很有用。

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