Effect of power spinning and heat treatment on microstructure evolution and mechanical properties of duplex low-cost titanium alloy  

作　　者：Zhongze Yang Wenchen Xu Weiqing Zhang Yu Chen Debin Shan 

机构地区：[1]National Key Laboratory for Precision Hot Processing of Metals&School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Materials Science & Technology》2023年第5期121-139,共19页材料科学技术（英文版）

摘　　要：The microstructural evolution and mechanical properties of low-cost Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si al-loy during power spinning and after three types of heat-treatment routines(low-temperature anneal-ing,high-temperature annealing,solution and annealing)were systematically studied.An effective heat-treatment routine to fabricate high-strength and acceptable ductile as-spun Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si alloy tubes was then proposed whereby the relationship between the mechanical performances and mi-crostructures was analyzed.The{0002}_(α)and{001}_(β)textures were formed after multi-pass power spin-ning.The as-spun LC-Ti alloy exhibited a good combination of strength and elongation after heat treat-ment at 550℃for 4 h,which was ascribed to the large plastic induced low-temperature spheroidization of deformedαphase and nanoscaleαprecipitation from deformedβphase.However,the elongation de-creased evidently when Zr2Si/TiCr2 participated at the interphase boundaries after heat treatment at 550℃for 8 h.In high-temperature annealing,the elongation changed nonlinearly owing to the precipitation of Zr2Si particles at triangular grain boundaries treated at 750℃for 1 h,and the spheroidization of the deformedα_(p)phase.Under solution and annealing conditions,lenticularαs would participate from the metastableβgrains,which contributed to the greatest strength albeit poor ductility.This study provides an effective guidance for the processing and application of the low-cost titanium alloy.

关 键 词：Low-cost titanium alloy Power spinning Heat treatment Microstructure evolution Mechanical property 

分 类 号：TG339[金属学及工艺—金属压力加工] TG156