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A nanocrystalline AlCoCuNi medium-entropy alloy with high thermal stability via entropy and boundary engineering
Materials Science and Engineering: A ( IF 6.1 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.msea.2020.138925
H.W. Deng , Z.M. Xie , M.M. Wang , Y. Chen , R. Liu , J.F. Yang , T. Zhang , X.P. Wang , Q.F. Fang , C.S. Liu , Y. Xiong

A promising strategy involving the synergetic effects of the high-entropy engineering and interface architectures has been proposed to realize the thermal stability of nanocrystalline alloys. A bulk dual-phase nanocrystalline (DPNC-) AlCoCuNi medium-entropy alloy was prepared by mechanical alloying (MA) and spark plasma sintering (SPS) process. These DPNC structures include Cu-rich and AlCoNi-rich nanocrystallines (NCs) with an average grain size of 46 nm. This DPNC-AlCoCuNi material could maintain the nanostructures as well as a high hardness of about 580 HV even after annealing at 900 °C for 50 h. The extremely high thermal stability has been attributed to the extensive thermal-stabled low-energy phase boundaries, low-angle grain boundaries, the high-entropy and sluggish diffusion effects.



中文翻译:

通过熵和边界工程获得具有高热稳定性的纳米晶AlCoCuNi中熵合金

提出了一种涉及高熵工程和界面结构协同效应的有前途的策略,以实现纳米晶合金的热稳定性。通过机械合金化(MA)和火花等离子体烧结(SPS)工艺制备了块状双相纳米晶(DPNC-)AlCoCuNi中熵合金。这些DPNC结构包括平均晶粒尺寸为46 nm的富含Cu和AlCoNi的纳米晶体(NC)。即使在900°C退火50 h后,这种DPNC-AlCoCuNi材料仍可以保持纳米结构以及约580 HV的高硬度。极高的热稳定性归因于广泛的热稳定低能相界,低角度晶界,高熵和缓慢的扩散效应。

更新日期:2020-01-07
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