Strain rate and temperature effects on tensile behavior of Ti/Al multilayered nanowire: A molecular dynamics study. (November 2019)

• Record Type: Journal Article
• Authors: Liu, Lanting; Deng, Qiong; Su, Mengjia; An, Minrong; Wang, Ruifeng
• Is Part Of: Superlattices and microstructures. Volume 135(2019)
• Publication Date: 2019-11
• Subjects: Ti/Al multilayered nanowire -- Strain rate effect -- Temperature effect -- Molecular dynamics simulation; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2019.106272
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: In this paper, the tensile behavior of Ti/Al multilayered nanowire was investigated by molecular dynamics simulation under a large range of strain rates and temperatures. The results show that strain rate and temperature significantly affect the tensile properties of Ti/Al multilayered nanowire. The value of strain rate sensitivity ( m ) changes at the critical strain rate of 1 × 10 9 s −1 above which the strength increases rapidly. Amorphization appears and dominates the plastic deformation of the nanowire above 1 × 10 9 s −1, and a superplasticity of the nanowire is observed. A linear relationship between the strength of the nanowire and the square root of temperature ( T 1/2 ) is founded. The surface nucleation plays a crucial role in the effects of strain rate and temperature on the microstructure evolution of the nanowire. The results in this study will enrich the exploration of Ti-based multilayered materials. Graphical abstract: Image 1 Highlights: Strain rate and temperature effects on tensile properties of Ti/Al multilayered nanowire is studied by MD simulations. A change of the value of strain rate sensitivity ( m ) is founded at the critical strain rate of 1 × 10 9 s −1 . The strength of the nanowire linearly decreases with the square root of temperature ( T 1/2 ). Difference of microstructure evolution under various strain rates and temperatures is due to surface nucleation effect.