热处理对Ti2448合金冷轧板组织和性能的影响

Effects of heat treatments on microstructure and mechanical properties of cold-rolled Ti2448 alloy

研究了热处理对Ti-24Nb-4Zr-8Sn(Ti2448)合金冷轧板材的显微组织和力学性能的影响,结果表明:Ti2448合金的杨氏模量和力学性能对其显微组织很敏感.在550-850℃,随着退火处理温度的升高Ti2448合金板材的晶粒长大,强度和杨氏模量降低而塑性提高;在400-500℃时效处理,合金中析出α相,控制时效时析出α相的形貌、含量和析出位置,可以调节合金强度、杨氏模量和塑性之间的匹配关系;控制热处理温度和时间可以实现高强度、低杨氏模量和良好室温塑性的匹配.

The effect of heattreatments on microstructure, Young＇s modulus and mechanical properties of cold-rolled Ti-24Nb-4Zr-8Sn （Ti2448）β type titanium alloy with nanostructured grains developed for biomedical application was investigated. The results show that the Young＇s modulus and mechanical properties of the alloy are sensitive to microsturctures generated by various heat treatments. Annealing treatments between 550 ℃ and 850℃ contribute to increase grain size and ductility but decrease strength and Young＇s modulus. Aging between 400℃ and 500 ℃, α phase precipitated from β matrix. The balanced properties of high strength, low elastic modulus and good ductility can be achieved by controlling the morphology and volume fractions of the α phase.