Experimental study of mechanical properties of bulk metallic glass under multi-axial stress condition and trial manufacture of specimen

本研究的目的是用多轴加载法确定大块金属玻璃的屈服面。为了实现这一实验方法，设计并制造了用于开发合适形状的试件的熔弧炉。用该炉试制的试件在熔融金属的冷却过程中容易结晶。为此，本文对基本屈服面进行了实验研究，其中包括：Zr_&lt；55&gt；Cu_&lt；30&gt；Al_&lt；10&gt；Ni_5BMG板材。此外，还找到了通过热塑性变形来改善锆基BMG的室温拉伸延性的方法。

The purpose of this research is the confirmation of the yield surface of bulk metallic glasses by multi-axial loading method. To carry out this experimental method, the melting arc furnace for the development of the specimen with appropriate shape was designed and fabricated. The specimen manufactured for trial by using the furnace crystallized easily on the cooling process of the melting metal. Therefore the experimental study for the basic yield surface was performed by Zr_<55>Cu_<30> Al_<10>Ni_5 BMG plate specimens. In addition, the method to improve the ductile property of Zr based BMG for tensile load at room temperature by its thermoplastic deformation was found out.