arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.0544cond-mat.mtrl-sci
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Al、Si、Mg、Cu和Fe合金的MEAM电位

MEAM potentials for Al, Si, Mg, Cu, and Fe alloys

Bohumir Jelinek, Sebastien Groh, Mark F. Horstemeyer, Jeffery Houze, Seong-Gon Kim, Gregory J. Wagner, Amitava Moitra, Michael I. Baskes

摘要:

为了研究金属合金化过程中Al、Si、Mg、Cu和Fe之间的相互作用,将各元素的MEAM势结合起来,建立了一套改进的嵌入原子法(MEAM)势。与从头算生成的广义层错能曲线相比,以前发表的单元素MEAM参数已被改进,以更好地符合广义层错能(GSFE)曲线。元素对的MEAM参数是根据从头计算获得的NaCl参考结构中元素对的结构和弹性性质构建的,并进行调整以重现最稳定的二元化合物的从头计算生成热。新的MEAM潜力进行了验证,通过比较缺陷的形成能,平衡体积,弹性模量,和生成热的几个二元化合物与从头计算模拟和实验。使处于其基态晶体结构的单个元素经受加热以测试高温下的电势。修改了Al势以避免在高温下形成非物理固体结构。测定了AA 6061合金的热膨胀系数,并与实验值进行了比较。在这项工作中进行的MEAM潜在的测试,利用通用的原子模拟环境(ASE),分布,以促进结果的再现性。

英文摘要:

A set of Modified Embedded Atom Method (MEAM) potentials for the interactions between Al, Si, Mg, Cu, and Fe was developed from a combination of each element's MEAM potential in order to study metal alloying. Previously published MEAM parameters of single elements have been improved for better agreement to the generalized stacking fault energy (GSFE) curves when compared with ab-initio generated GSFE curves. The MEAM parameters for element pairs were constructed based on the structural and elastic properties of element pairs in the NaCl reference structure garnered from ab-initio calculations, with adjustment to reproduce the ab-initio heat of formation of the most stable binary compounds. The new MEAM potentials were validated by comparing the formation energies of defects, equilibrium volumes, elastic moduli, and heat of formation for several binary compounds with ab-initio simulations and experiments. Single elements in their ground state crystal structure were subjected to heating to test the potentials at elevated temperatures. An Al potential was modified to avoid formation of an unphysical solid structure at high temperatures. The thermal expansion coefficient of a compound with the composition of AA 6061 alloy was evaluated and compared with experimental values. MEAM potential tests performed in this work, utilizing the universal Atomistic Simulation Environment (ASE), are distributed to facilitate reproducibility of the results.

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