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Single-crystal Al–Cu50Zr50 metallic glass cold welds: tensile and creep behaviour
Molecular Simulation ( IF 2.1 ) Pub Date : 2019-09-04 , DOI: 10.1080/08927022.2019.1661411
Rohit Singh 1 , Pradeep Gupta 1 , Natraj Yedla 1
Affiliation  

ABSTRACT Tensile and creep properties of dissimilar cold weld joints (Al (metal)–Cu50Zr50 (metallic glass)) are investigated using molecular dynamics simulations. Embedded atom method potential is used to model the interactions between Al–Cu–Zr atoms. Cold welding is carried out at three different velocities (20, 30 and 40 m/s) and for three interferences (0.4, 1.3 and 2.3 nm). The strength of the welded joints is measured using the tensile test carried out at a strain rate of 1.5 × 109/s. Structure studies by radial distribution function analysis indicate amorphisation of Al in the weld regions. Tensile studies show that the maximum strength is obtained in the sample that is welded for 1.3 nm interference. Creep studies carried out over range of stresses (200–350 MPa) and temperatures (200–500 K) show very short primary creep and significant steady-state creep. The stress exponent n has two values; at lower stress, n = 1.2, and at higher stress, n = 4.06, respectively. The deformation mechanisms are observed to be slip by Shockley partial dislocation and by twinning in Al region. The icosahedral cluster population in metallic glass decreases as the temperature increases and contributes to large plastic strain.

中文翻译:

单晶 Al-Cu50Zr50 金属玻璃冷焊缝:拉伸和蠕变行为

摘要使用分子动力学模拟研究了不同冷焊接头(Al(金属)-Cu50Zr50(金属玻璃))的拉伸和蠕变性能。嵌入原子法势用于模拟 Al-Cu-Zr 原子之间的相互作用。冷焊以三种不同的速度(20、30 和 40 m/s)和三种干涉(0.4、1.3 和 2.3 nm)进行。焊接接头的强度使用在 1.5 × 109/s 的应变速率下进行的拉伸试验测量。通过径向分布函数分析的结构研究表明焊接区域中的 Al 非晶化。拉伸研究表明,在 1.3 nm 干涉下焊接的样品中获得了最大强度。在应力 (200-350 MPa) 和温度 (200-500 K) 范围内进行的蠕变研究表明,初级蠕变非常短,稳态蠕变显着。应力指数 n 有两个值;在较低的压力下,n = 1.2,在较高的压力下,n = 4.06,分别。观察到变形机制是通过肖克利部分位错和 Al 区域的孪晶滑动。金属玻璃中的二十面体簇群随着温度升高而减少,并导致大的塑性应变。
更新日期:2019-09-04
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