Thoreical and Experimental Studies on Nanoindentation and Mechanical Properties of Amorphous NiAl Alloys

• Main Authors: Po-Chien Cheng, 鄭博謙
• Other Authors: Te-Hua Fang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/hjv2vj

碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 102 === This objective of this study is nanoscale mechanical behavior of amorphous NiAl alloy. This study mainly includes simulations and experiment, a simulation study on the behavior of slip system, plastic deformation, elastic recovery and hardness at different proportion and temperature using nanowire tensile and nanoindentation by molecular dynamics, a experiment study of adhesion force, surface roughness, Young’s modulus and hardness of NiAl amorphous by AFM and nanoindentation. The tensile simulation result shows the fracture toughness of amorphous alloys is better than single crystal, then Ni70 : Al30 has best elongation and Young’s modulus, before the temperature rises to 900 K, the fracture strain increase with adhesion force. The indentation simulation result show that the hardness increases with increasing Ni content, and temperatures is closed to the melting point, the hardness begins to decrease significantly, the recovery in Ni-based is better than that in Al-based, and recovery decrease with increasing temperature. The experiment result shows the hardness and Young’s modulus increase with increasing Ni content of the sample. The lower roughness of Ni-based and higher adhesion force of Al-based was observed by AFM measurements.