Design of self-stable nanocrystalline high-entropy alloy

被引:8
作者
Adaan-Nyiak, Moses A. [1 ]
Alam, Intekhab [1 ]
Arcuri, Gabriel A. [2 ]
Tiamiyu, Ahmed A. [1 ]
机构
[1] Univ Calgary, Dept Mech & Mfg Engn, 2500 Univ Drive NW, Calgary, AB T2N 1N4, Canada
[2] McMaster Univ, Canadian Ctr Electron Microscopy, 1280 Main St West, Hamilton, ON L8S 4M1, Canada
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
High -entropy alloy; AlCoCrFe HEA; Nanocrystalline alloys; Grain boundary segregation; Nanograin stability; Self -stabilizing effect; GRAIN-BOUNDARY SEGREGATION; HIGH-TEMPERATURE STABILITY; NI-W ALLOYS; MECHANICAL-PROPERTIES; THERMAL-STABILITY; STABILIZATION; GROWTH; EMBRITTLEMENT; SIMULATIONS; COMPLEXIONS;
D O I
10.1016/j.matdes.2023.112482
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanocrystalline (NC) materials are prone to grain-coarsening at low temperatures-requiring extra soluteelement addition for stability. While this approach is established mainly in simple-binary-alloys, it is adjudged "complex" for multicomponent-alloys due to complex-interactions among constituent-elements. We report for the first time that nanograins in multicomponent-high entropy alloy (HEA) stabilize themselves without requiring additional solute if constituent-HEA-elements with highest mixing enthalpy and melting point preferentially segregate to grain boundaries (GBs); a process we term self-stabilization effect in HEAs. Using in-situ Xray diffraction, scanning/transmission electron microscopy, and atom-probe-tomography (APT), we show that Cr and Fe in NC-AlCoCrFe-HEA (9 nm grain-size) segregate at GBs by site-competition to stabilize it at 0.5Tm (Tm-melting temperature). At 0.6Tm, GB-desegregation is established to be precursor to phase decomposition, and it competes with nanograin stability; this culminates in the onset of grain coarsening at this temperature. Compared with the literature (e.g., NC-AlCoCrFeNi), NC-AlCoCrFe HEA shows exceptional nanograin-stability at high homologous-temperatures; this suggests possible breakdown of the cocktail and sluggish-effects in HEAs, since more elements do not necessarily improve nanograin stability. To the authors' knowledge, this is the finest stable-NC-HEA produced-it paves a new way of engineering NC-HEAs without coarsening in scalable solid-state processes that require substantially-high temperatures.
引用
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页数:14
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