冷轧Ti-Nb-Zr-O高弹性钛合金的组织演变和力学性能

Microstructure evolution and mechanical properties of cold rolled Ti-Nb-Zr-O high elastic titanium alloy

以Ti-35Nb-2Zr-0.3O(Ti3523)为研究对象,研究了冷轧变形量对合金的组织和性能的影响规律,分析了其塑性变形机制。结果表明:冷轧过程中,合金存在{332}<113>孪生变形、应力诱发马氏体α″相变、滑移变形三种变形机制。当变形量为42.3%时,应力诱发马氏体相变,较强的<110>织构和晶体缺陷密度较多的松散结构导致其弹性模量较低,此时Ti3523合金的弹性模量仅为54 GPa、屈服强度为875 MPa、抗拉强度可达1013 MPa,实现了单一材料高强度和低弹性模量的有机调和,有望满足高超声速、可变机翼飞行器等新型航空装备对高性能弹性材料的需求。

The effects of cold rolling deformation on the microstructure and properties of Ti-35Nb-2Zr-0.3O(Ti3523)titanium alloy were studied,and the plastic deformation mechanism was analyzed.The results show that there are three deformation mechanisms during the cold rolling process:{332}<113>twining,stress-induced martensiticα″transformation and slipping.The stress-induced martensitic transformation,the appearance of<110>texture and the more“looser”structure due to high crystal defect density lead to the lowest elastic modulus at the deformation of 42.3%.At this time,the elastic modulus of Ti3523 alloy is only 54 GPA,and the yield strength and tensile strength of Ti3523 alloy can reach 875 MPa and 1013 MPa,respectively.High strength and low elastic modulus were well coordinated in the single material Ti3523,which was expected to meet the requirements of high performance elastic materials for hypersonic,variable wing aircraft and other new aviation equipment.