The cryogenic mechanical property deviation of Ti-based bulk metallic glass composite induced by interstitial element

Although most bulk metallic glass composites (BMGCs) will undergo ductile-to-brittle transition at cryogenic temperature, significant low temperature compression and tensile ductility have been found in a BMGC with the composition of Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅. In present work, the cryogenic mechanical behavior of BMGCs containing interstitial element was studied for understanding the multiple reinforcement of BMGCs in low temperature environment and for explaining the differences in cryogenic properties of BMGCs. Results show that the Ti-based BMGC will be much more sensitive to impurity elements in cryogenic environment than that at room temperature. Besides, the increase in yield strength of BMGCs with the decrease of temperature is not simply due to the dislocations motion in the dendrites becomes more difficult. Low temperature environment can strengthen the glassy matrix as well as increase the strength of dendrites. Results imply Ti₄₈Zr₂₀Nb₁₂Cu₅Be₁₅ BMGC can be a kind of promising materials for low-temperature applications.