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Bond-order potentials for the Ti_3AlC_2 and Ti_3SiC_2 MAX phases

机译:TI_3ALC_2和TI_3SIC_2最大阶段的键合势

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摘要

Bond-order potentials have been developed for the Ti3AlC2 and Ti3SiC2 MAX phases within the Tersoff formalism. Parameters were determined by independently considering each interatomic interaction present in the system and fitting them to the relevant structural, elastic, and defect properties for a number of unary, binary, and ternary structures. A number of material properties, including those not used in the fitting procedure, are reproduced with a high degree of accuracy when compared to experiment and ab initio calculations. Additionally, well-documented MAX phase behaviors such as plastic anisotropy and kinking nonlinear elasticity are demonstrated to be captured by the potentials. As a first highly accurate atomistic model for MAX phases, these potentials provide the opportunity to study some of the fundamental mechanisms behind unique MAX phase properties. Additionally, the fitting procedure employed is highly transferable and should be applicable to numerous other MAX phases.
机译:已经为TI3ALC2和TI3SIC2最大阶段开发了键合的电位,在TESSOFF形式主义中。通过独立考虑系统中存在的每个内部相互作用并将它们装配到许多一组,二元和三元结构的相关结构,弹性和缺陷性能来确定参数。与实验和AB Initio计算相比,许多材料属性包括在拟合程序中未使用的那些材料,以高精度再现。另外,记录了良好记录的最大相行为,例如塑料各向异性和扭结非线性弹性,以通过电位捕获。作为最大阶段的第一个高度准确的原子模型,这些潜力提供了研究唯一最大相位属性背后的一些基本机制的机会。此外,所采用的配件程序是高度可转移的,应适用于许多其他最大阶段。

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  • 来源
    《Physical review》 |2019年第21期|214114.1-214114.12|共12页
  • 作者单位

    Colorado Sch Mines Dept Mech Engn Golden CO 80401 USA;

    Colorado Sch Mines Dept Mech Engn Golden CO 80401 USA;

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