Effect of Y and Nd Elements on the Mechanical and Shearing Fracture Properties of Cu-Zr-Al Bulk Metallic Glasses

• Main Authors: LIN, YI-JYUN, 林宜君
• Other Authors: CHEN, TAO-HSING
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/31967683356732317108

碩士 === 國立高雄應用科技大學 === 機械工程系 === 105 === In this thesis, the effects of different elements addition in the Cu-based bulk metallic glass (BMG) alloys on the mechanical property and glass forming ability (GFA) are investigated. The mechanical properties of the Cu-Zr-Al BMG alloy are tested by using a Universal Testing Machine and a split Hopkinson bar under the strain rate of 10-3 s-1to 4×103 s-1. Furthermore, the crystal structure, glass forming ability and thermal property are studied by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The experimental results indicated that the flow stress and strain rate sensitivity for the different elements addition of Cu-based BMG alloys vary clearly with the strain and strain rate. As the strain rate increases, the plastic flow stress and strain rate sensitivity increase. When the Y element content increases to 3 at.% and Nd element content increases to 1 at.%, it can be observed that not only the glass forming ability, but also the mechanical strength and plasticity of these bulk metallic alloys are improved. Finally, from the fracture surface analysis, the Y and Nd elements addition can improve the ductility of these Cu-based BMG alloys.