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Creep behavior of an AlTiVNbZr0.25 high entropy alloy at 1073 K
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.msea.2020.139291
Petr Kral , Wolfgang Blum , Jiri Dvorak , Nikita Yurchenko , Nikita Stepanov , Sergey Zherebtsov , Lenka Kuncicka , Marie Kvapilova , Vaclav Sklenicka

The deformation behavior of an AlTiVNbZr0.25 high entropy alloy at 1073 K was investigated in creep in protective argon atmosphere at stresses of 100–560 MPa with and without changes. In the initial condition after annealing at 1473 K for 24 h the alloys was composed of B2 matrix phase and coarse Zr5Al3-type particles. During creep a limited amount of new Nb2Al-type sigma phase precipitates at the Zr5Al3/B2 hetero-phase interface and a quasi-stationary dislocation density of the expected order of magnitude are developed. The quasi-stationary creep rate obeys a three-power law and the transients after stress changes are inverted. This is interpreted in terms of the class A creep behavior with viscous glide due to cloud drag.



中文翻译:

AlTiVNbZr 0.25高熵合金在1073 K时的蠕变行为

研究了AlTiVNbZr 0.25高熵合金在1073 K时在保护性氩气氛中蠕变在100-560 MPa应力下的变形行为,有无变化。在1473 K退火24小时后的初始条件下,合金由B2基体相和粗Zr 5 Al 3型颗粒组成。在蠕变期间,在Zr 5 Al 3处析出了数量有限的新Nb 2 Al型σ相开发了/ B2异相界面和预期数量级的准平稳位错密度。准平稳蠕变速率服从三幂定律,应力变化反转后的瞬变。这是由于A级蠕变行为以及由于云阻力引起的粘性滑移而解释的。

更新日期:2020-03-30
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