CAJ | 학술논문

研究Si元素的添加对Ti-55Ta合金的微观组织、力学性能及形状记忆特性的影响.结果表明:合金的微观组织主要由a＂马氏体相和少量β相组成；当添加Si时,合金晶粒明显细化,且当x＝0.2时,合金中开始析出沉淀相,这些沉淀相主要集中在晶界处,可以阻碍晶粒长大,从而进一步细化合金晶粒.背散射电子衍射分析表明,该沉淀相为(Ti,Ta)3Si相.Ti-55Ta-xSi合金的拉伸应力-应变曲线呈现明显的双屈服现象,且随着Si含量的增加,合金的拉伸和屈服强度升高,伸长率反而减小.Si的添加可以明显改善Ti-55Ta合金的形状记忆效应,且在x＝0.1时,合金呈现出最大的形状记忆效应及最低的弹性模量.
연구Si원소적첨가대Ti-55Ta합금적미관조직、역학성능급형상기억특성적영향.결과표명:합금적미관조직주요유a＂마씨체상화소량β상조성；당첨가Si시,합금정립명현세화,차당x＝0.2시,합금중개시석출침정상,저사침정상주요집중재정계처,가이조애정립장대,종이진일보세화합금정립.배산사전자연사분석표명,해침정상위(Ti,Ta)3Si상.Ti-55Ta-xSi합금적랍신응력-응변곡선정현명현적쌍굴복현상,차수착Si함량적증가,합금적랍신화굴복강도승고,신장솔반이감소.Si적첨가가이명현개선Ti-55Ta합금적형상기억효응,차재x＝0.1시,합금정현출최대적형상기억효응급최저적탄성모량.
The effects of Si addition on microstructures,mechanical and shape memory properties of Ti-55Ta biomedical alloy were investigated.The results show that the microstructures consist of mainly α" martensite and a little β phase,and the grain size decreases obviously with increasing Si addition.When x ＝ 0.2,small (Ti,Ta)3Si precipitates are formed at grain boundaries.With further increasing Si content,the amount of the precipitates gradually increases.The tensile and yield strength of Ti-55Ta-xSi alloys gradually increase with increasing Si addition,whereas elongation decreases.Ti-55Ta-0.1Si alloy exhibits the lowest elastic modulus and the best shape memory recoverable strain.It is revealed that the refinement of grain and the precipitation of (Ti,Ta)3Si phase are responsible to the changes of their mechanical and shape memory properties.