Philosophical Magazine Letters ( IF 1.2 ) Pub Date : 2021-11-11 , DOI: 10.1080/09500839.2021.1998692 Hongwei Yao 1 , Dongxu Qiao 1 , Junwei Miao 1 , Jun Wang 2 , Enyu Guo 1, 3 , Yiping Lu 1, 3
ABSTRACT
The refractory high-entropy alloys (RHEAs) have been the subject of considerable research in recent years. Since the Laves phase usually leads to a dramatic decrease in the malleability of RHEAs at ambient temperatures, it is critical to identifying the Laves-phase formation. Here, a facile and effective criterion is proposed to predict the phase stability based on the empirical parameters of reported RHEAs. The results indicate that the small atomic size difference is a sufficient condition for determining the stability of solid solution but not a necessary one. In general, the Laves-phase precipitates can be inhibited by decreasing the atomic-size difference, the enthalpy of mixing, and the valence electron concentration. These criteria can be easily adapted to design new RHEAs with the desired phase structure.
中文翻译:
难熔高熵合金中熔相形成的标准
摘要
难熔高熵合金(RHEAs)是近年来大量研究的主题。由于 Laves 相通常会导致 RHEA 在环境温度下的延展性急剧下降,因此识别 Laves 相的形成至关重要。在这里,提出了一种简单有效的标准来预测基于报告的 RHEA 的经验参数的相稳定性。结果表明,较小的原子尺寸差异是确定固溶体稳定性的充分条件,但不是必要条件。一般来说,可以通过降低原子尺寸差、混合焓和价电子浓度来抑制 Laves 相沉淀。这些标准可以很容易地适应设计具有所需相结构的新 RHEA。