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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ab initio study of the alloying effect of transition metals on structure, stability and ductility of CrN
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Ab initio study of the alloying effect of transition metals on structure, stability and ductility of CrN

机译:从头开始研究过渡金属的合金化对CrN的结构,稳定性和延展性的影响

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摘要

The alloying effect on the lattice parameters, isostructural mixing enthalpies and ductility of the ternary nitride systems Cr_(1-x)TM _xN (TM = Sc, Y; Ti, Zr, Hf; V, Nb, Ta; Mo, W) in the cubic B1 structure has been investigated using first-principles calculations. Maximum mixing enthalpy due to large lattice mismatch in Cr_(1-x)Y_xN solid solution shows a strong preference for phase separation, while Cr _(1-x)Ta_xN exhibits a negative mixing enthalpy in the whole compositional range with respect to cubic B1 structured CrN and TaN, thus being unlikely to decompose spinodally. The near-to-zero mixing enthalpies of Cr _(1-x)Sc_xN and Cr_(1-x)V_xN are ascribed to the mutually counteracted electronic and lattice mismatch effects. Additions of small amounts of V, Nb, Ta, Mo or W into CrN coatings increase its ductility.
机译:合金化对三元氮化物体系Cr_(1-x)TM _xN(TM = Sc,Y; Ti,Zr,Hf; V,Nb,Ta; Mo,W)的晶格参数,同构混合焓和延展性的影响已使用第一性原理研究了立方B1结构。 Cr_(1-x)Y_xN固溶体中由于晶格失配较大而产生的最大混合焓显示出相分离的强烈偏好,而Cr _(1-x)Ta_xN在整个组成范围内相对于立方B1表现出负的混合焓结构化的CrN和TaN,因此不太可能发生分解。 Cr _(1-x)Sc_xN和Cr_(1-x)V_xN的接近零混合焓归因于相互抵消的电子和晶格失配效应。在CrN涂层中添加少量V,Nb,Ta,Mo或W可提高其延展性。

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