摘要
使用XRD、TEM、DSC和室温拉伸等分析测试手段,对冷轧后经不同退火温度处理的Ti-13V-3Al-0.5Cu(%,原子分数)合金微观组织结构,马氏体相变行为,力学性能和形状记忆性能进行了研究。经冷轧、退火处理后,合金在室温下的组织主要为α"马氏体相,存在少量残余β母相、α相和Ti2Cu第二相。随着退火温度的增加,合金形状记忆性能先升高后降低;当退火温度为750℃时,在预应变量为6%的前提下可实现5.3%的可回复应变。其组织结构观察结果表明,经冷轧、退火处理后,合金中α"马氏体形貌由"V"字型自协作组态向择优取向的单一取向马氏体板条转化,界面可动性提升,马氏体临界再取向应力降低,形状记忆性能提高。
The effect of post annealing temperature on the microstructure,martensitic transformation behavior,mechanical properties and shape memory effect of the cold rolled Ti-13 V-3 Al-0.5 Cu(%,atomic fraction)alloy was systematically studied by means of XRD,TEM,DSC and tensile test at room temperature.The results showed that the phase composition of the alloy at room temperature was mainlyα"phase,together with a small amount of remainedβphase,αphase and Ti2Cu second phase.With the increasing annealing temperature,the shape memory property increased firstly and then decreased.When the annealing temperature is 750℃,the alloy showed a good shape memory effect and the recoverable strain up to 5.3%when the pre-strain was 6%.Furthermore,the morphology of martensite transformed from a V-shape like self-coordinated-structure to a structure of single preferential orientation when the alloy was subjected to a proper cold rolling and annealing treatment.Lower reorientation critical stress and better interface mobility were the main causes for the improvement of shape memory effect.
作者
孙馗善
李珺
孟祥龙
蔡伟
SUN Kuishan;LI Jun;MENG Xianglong;CAI Wei(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150006,China;College of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2020年第10期721-729,共9页
Chinese Journal of Materials Research
基金
国家自然科学基金(51871080,51571073)。
