Microstructures and mechanical properties of as-cast titanium-zirconium-molybdenum ternary alloys

作者：Yang, C. D.; Wang, S. P.; Shi, J. J.; Wang, C. H.; Ren, Z. M.; Cao, G. H.^*

来源：Materialwissenschaft und Werkstofftechnik, 2018, 49(1): 30-38.

DOI：10.1002/mawe.201700060

• Titanium alloys
• transmission electron microscopy
• omega phase
• microstructure
• mechanical properties

In this study titanium-zirconium-molybdenum alloys (Ti50Zr50)(100-x)Mo-x (xMo; x=0 at.%, 1 at.%, 3 at.%, 5 at.% or 7 at.%) were investigated, focusing on the effect of molybdenum addition on their microstructures and mechanical properties. Transmission electron microscopy observations revealed that the binary Ti50Zr50 alloy was composed entirely of an acicular hexagonal structure of the alpha' phase. When the molybdenum content was 1 at.%, the alloy was composed of beta and omega phases. However, when 3 at.% or more molybdenum was added, only the equiaxed, retained beta phase was observed. Tensile tests at room temperature indicated that the mechanical properties of the 1Mo alloy were inferior owing to the embrittlement effects of the omega phase and the difficulty of dislocation motion through the omega phase. Our research suggested that the 5Mo alloy had excellent ductility (16.5%) as well as adequate strength (780MPa). The improved mechanical properties were attributed to the enhanced stability of the beta phase and the disappearance of the omega phase.

• 出版日期2018-1
• 单位上海大学