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Effect of size and strain rate on deformationudbehaviour of Cu50Zr50 metallic glass: A molecular dynamics simulation study

机译:尺寸和应变率对变形的影响Cu50Zr50金属玻璃的行为:分子动力学模拟研究

摘要

Metallic glasses or amorphous metals have attracted considerable attention due to their unique properties and have been evolved as a potential field of research in recent years. The recent discovery of new glass-forming compositions makes it possible to produce metallic glasses in bulk shapes. Bulk metallic glasses provides a promising future to revolutionize the field of structural materials with combinations of strength, elastic limit, toughness, wear resistance and corrosion resistance. Some of their superior properties over crystalline metals have made them a versatile engineering material for many commercial applications now-a-days. Since the fabrication of metallic glasses require high cooling rates and sometimes practically impossible in laboratory conditions, so computational approaches are extensively used to explore various properties and behaviour of metallic glasses. udThis project work presents a molecular dynamics simulation study on deformation behaviour of Cu50Zr50 metallic glass where the effect of parameters like sample-size and strain rate on the tensile deformation behaviour have been thoroughly studied. Computational methods to create alloy models, subsequent quenching and further tensile deformation have been mentioned. Stress-strain plots were drawn at same strain rate for different sizes of alloy models and at different strain rates for a particular size. Reasons for getting different stress-stress curves for different conditions have also been discussed.
机译:金属玻璃或非晶态金属由于其独特的性能而引起了相当大的关注,并且近年来已发展成为潜在的研究领域。新的玻璃形成组合物的最新发现使得有可能生产大块形状的金属玻璃。大块金属玻璃通过结合强度,弹性极限,韧性,耐磨性和耐腐蚀性,为革新结构材料领域提供了广阔的前景。它们具有某些优于结晶金属的性能,从而使其成为当今许多商业应用的通用工程材料。由于金属玻璃的制造需要很高的冷却速度,有时在实验室条件下实际上是不可能的,因此计算方法被广泛用于探索金属玻璃的各种特性和行为。 ud这项研究工作提供了分子动力学模拟研究,研究了Cu50Zr50金属玻璃的变形行为,其中充分研究了样品大小和应变速率等参数对拉伸变形行为的影响。已经提到了创建合金模型,随后的淬火和进一步的拉伸变形的计算方法。对于不同尺寸的合金模型,以相同的应变率绘制应力-应变图,对于特定尺寸,以不同的应变率绘制应力-应变图。还讨论了在不同条件下获得不同应力-应力曲线的原因。

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