摘要
低模量β型钛合金作为生物医用材料得到了广阔的发展.国内外研究者发现添加O,N和H等间隙元素能够有效提高β型钛合金的力学性能.其中,O是研究最广泛的间隙元素.以国内外研究结果为基础,综述了O对β型钛合金的显微组织、相变、力学性能和超弹性的影响.O元素能够细化β相晶粒,但过多则会产生偏析.O抑制淬火过程中α″和ω两种马氏体转变.O具有很强的固溶强化作用,显著提高钛合金强度、硬度和耐磨性.O提高β相临界滑移强度和降低Ms点的作用有益于合金的超弹性和形状记忆效应.
β-type Ti alloys with low Young＇s modulus have been widely developed for biomedical applications.It has been pointed that addition of interstitial elements,such as oxygen,nitrogen and hydrogen,could significantly improve the mechanical properties ofβ-type Ti alloys.Oxygen is the most widely investigated interstitial elements.Based on domestic and abroad results,the present paper summarizes the influence of oxygen on microstructure,phase transformation,mechanical properties and super-elasticity.Oxygen can refine the β-phase grains,but excess will cause segregation.It also suppresses bothα″andωmartensite transforamtion during quenching.Oxygen also involves great solution hardening and remarkably improves strength,hardness and wear resistant of Ti alloys.Increasing of critical slip strength inβphase and reduction of Mscaused by oxygen addition are benefit for optimizing super-elasticity and shape memory effect.
出处
《有色金属材料与工程》
CAS
2017年第6期351-355,共5页
Nonferrous Metal Materials and Engineering
基金
上海市自然科学基金项目(15ZR1428400)
上海市科技支撑计划项目(16060502400)
关键词
Β型钛合金
O元素
显微组织
力学性能
β-type titanium alloys
oxygen
microstructure
mechanicll properties
