摘要
研究了新型医用近β钛合金Ti-3Zr-2Sn-3Mo-25Nb(质量分数,%)不同组织状态的的弹性变形行为。具有单一β相的固溶态合金表现出典型的双屈服现象,在与应力诱发马氏体相关的第一屈服之前显示出一定程度的非线性弹性变形特征。时效处理后,由拉伸测试所得的合金初始弹性模量的变化与时效析出α相体积含量没有明显的对应关系;然而弹性模量随着β晶粒与α相尺度的减小而增大。提出合金加载过程中,晶格剪切被细小α相有效阻止,这将导致合金较高的静态弹性模量的出现以及非线性弹性特征的减弱。
Elastic deformation behavior of near β-type titanium alloy Ti-3Zr-2Sn-3Mo-25Nb(mass fraction, %) newly developed for biomedical application was described. The solution treated state alloy exhibits typical 'double yields' in stress-strain curves and approximate nonliner elastic deformation behavior before the first yield points related to stress-induced α? martensitic transformation. After ageing, the incipient elastic modulus determined by tensile test seems independent to the volume fraction of α phase, while increases with decrease in the size of β grain and α phase. It is proposed that lattice shear can be blocked more effectively by the finer α phase, which probably leads to higher static elastic modulus and more unconspicuous nonlinearity elastic deformation behavior.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第S1期132-136,共5页
Rare Metal Materials and Engineering
基金
National Key Technology R&D Program(2012BAI18B02)
National Natural Science Foundation of China(31100693/C100302)
Major State Basic Research Development Program of China(2012CB619102)
National High Technology Research and Development Program of China(2011AA030101)
Industrial Research Projects of Shaanxi Province(2012K07-03)
