TB17钛合金等温时效析出行为  

Isothermal Aging Precipitate of TB17 Titanium Alloy

作　　者：王哲[1] 王新南[1] 祝力伟[1] 朱知寿[1] 

机构地区：[1]北京航空材料研究院先进钛合金航空科技重点实验室,北京100095

出　　处：《航空材料学报》2016年第5期1-6,共6页Journal of Aeronautical Materials

基　　金：总装预研加强项目基金(51312JQ01)

摘　　要：采用X射线衍射(XRD)、透射电子显微镜(TEM)、光学显微镜(OM)等对新型超高强韧TB17钛合金次生α相转变动力学进行研究。实验结果表明,该合金经β相区固溶,520℃不同保温时间时效后,片层次生α相在β相基体上析出、形核、长大,并且与基体具有柏氏共格关系。短时时效后次生α相呈针状,随着保温时间延长,次生α相粗化呈短棒状。析出相含量对TB17钛合金强化具有重要影响,TB17钛合金在完全析出过程中,次生α相含量增加,时效硬化作用增加。TB17钛合金次生α相等温相变动力学采用JMAK方程进行描述。Transmission Electron Microscope （TEM） , X-Ray Diffraction（ XRD） and Optical Microscope（ OM） were employed to investigate the aging precipitation behavior of a new type of ultra-high strength TB17 titanium alloy. The results show that during heat solution treated in the β phase field followed by aging the secondary a phase is nucleated, precipitated and grew on the β phase matrix, and the precipitated phase is lamellar structure which has burgers relation with the matrix. The secondary a phase content is increased rapidly and finally reach a steady-state as aging time increased and the final product of aging consists of a phase and β phase, there is a good linearity relationship between the content of secondary a phase and the hardness of age hardening. The TB17 titanium alloy iso-thermal phase transformation kinetics can be described by JMAK equation.

关 键 词：TB17钛合金 等温时效 次生相α相 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]