Effects of solution-aging treatment on microstructure and mechanical properties of a high-strength and high-toughness titanium alloy

Abstract

Solution-aging treatment was performed to a high-strength and high-toughness titanium alloy.Several microstructural feature including volume fraction of primary α phase,size factor of primary α phase,volume fraction of secondary α phase,αs/ β interface density,were quantitatively characterized. By making a statistical analysis of the microstructure characteristics,the relationship between microstructure features and mechanical properties of the high-strength and high-toughness titanium alloy was investigated as solution temperature changed. The results show that with the increase of solution temperature in α + β phase,the volume fraction of primary α phase decreases,the size factor of primary α phase firstly decreases and then increases,volume fraction of secondary α phase increases,and the αs/ β interface density increases and then decreases.The elongation,static toughness and crack initiation energy increase with the growth of the volume fraction of primary α phase. And yield strength is positively correlated with the αs/ β interface density.