A method to determine main microstructural features influencing mechanical properties of two-phase titanium alloys

作者：Shi, Zhifeng^*; Guo, Hongzhen; Qin, Chun; Liang, Houquan; Yao, Zekun

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 611: 136-141.

DOI：10.1016/j.msea.2014.05.086

• Two-phase titanium alloys
• Ternary microstructural system
• Microstructural features
• Major-minor sequence
• Mechanical properties

A new method to determine the major-minor sequence of microstructural features influencing mechanical properties of two-phase titanium alloys was proposed in a ternary microstructural system composed of equiaxed alpha phase, coarse a plates and residual beta matrix in this investigation. The triplex heat treatment in (alpha+beta) two-phase field was carried out on two-phase titanium alloys to change the relative contents of three microstructural features. The microstructure-property relationships described in the form of three-dimensional curved surface were established by interpolating property data and corresponding content data of these microstructural features in a stereoscopic triangular coordinate system. The major-minor sequence of microstructural features was determined by comparing the angles between contour lines of property surfaces and coordinate axes. The main microstructural feature influencing alloy's properties in a binary microstructual system was determined by superimposing the vertical section of a three-dimensional property surface along one coordinate axis and its corresponding major-minor sequence distribution. Validated using Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-Si alloy, the method is generally applicable to all two-phase titanium alloys or other alloys having a ternary microstructural system.

• 出版日期2014-8-12
• 单位西北工业大学