Exploration of the microstructure space in TiAlZrN ultra-hard nanostructured coatings

被引:21
作者
Attari, Vahid [1 ,2 ]
Cruzado, Aitor [3 ,4 ]
Arroyave, Raymundo [1 ,2 ,4 ,5 ]
机构
[1] Texas A&M Univ, Dept Mat Sci, College Stn, TX 77843 USA
[2] Texas A&M Univ, Engn Dept, College Stn, TX 77843 USA
[3] Texas A&M Univ, Dept Aerosp Engn, College Stn, TX 77843 USA
[4] Texas A&M Univ, TEES, Ctr Intelligent Multifunct Mat & Struct, College Stn, TX 77843 USA
[5] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA
基金
美国国家科学基金会;
关键词
Transition metal nitrides; Spinodal decomposition; Nanostructures; Phase field modeling; TI-AL-N; SPINODAL DECOMPOSITION; THERMAL-STABILITY; PHASE-STABILITY; MECHANICAL-PROPERTIES; METAL NITRIDES; COOLING RATE; FILMS; ZR; THERMODYNAMICS;
D O I
10.1016/j.actamat.2019.05.047
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ti1-x-yAlxZryN cubic alloys within the 25-70% Al composition range have high age-hardening capabilities due to metastable phase transition pathways at high temperatures. They are thus ideal candidates for ultra-hard nano-coating materials. There is growing evidence that this effect is associated with the elasto-chemical field-induced phase separation into compositionally-segregated nanocrystalline nitride phases. Here, we studied the microstructural evolution in this pseudo-ternary system within spinodal regions at 1200 degrees C by using an elasto-chemical phase field model. Our simulations indicate that elastic interactions between nitride nano-domains greatly affect not only the morphology of the microstructure but also the local chemical phase equilibria. In Al-rich regions of the composition space we further observe the onset of the transformation of AIN-rich phases into their equilibrium wurtzite crystal structure. This work points to a wide palette of microstructures potentially accessible to these nitride systems and their tailoring is likely to result in significant improvements in the performance of transition metal nitride-based coating materials. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:459 / 476
页数:18
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