(1. 西北有色金属研究院 钛合金研究所,西安 710016;2. 西北工业大学 材料学院,西安710072)
摘 要: 设计了3种三元系近β钛合金,并对合金的组织与性能进行了分析,研究了各元素对合金组织特征与力学性能的影响。结果表明:经400 ℃时效后,3种合金硬度由大到小依次为合金3、合金2、合金1;经500、600、700 ℃时效后,3种合金硬度由大到小依次为合金3、合金1、合金2;3种合金固溶时效处理后的强塑性匹配由高到低为合金1、合金2、合金3,在相同时效制度下,合金1的断裂韧性优于合金2的;添加Mo和V元素可以提高裂纹产生的抗力,从而提升合金的断裂韧性,并且Mo元素的效果比V元素的好。
关键字: β钛合金;时效;析出相;硬度;强塑性
(1. Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
Abstract:Three new type metastable β titanium alloys were designed. The structure and properties of the ternary system titanium alloy were investigated systematically. The effects of alloy elements on the structures and mechanical properties of these ternary system titanium alloys were also studied. The results show the sequence from large to small of the hardness of alloy aged at 400 ℃ is alloy 3, alloy 2 and alloy 1. The sequence from large to small of hardness for the same alloy aged at 500, 600, and 700 ℃ is alloy 3, alloy 1 and alloy 2, respectively. The reasonable match between ductility and strength of these alloys after aging, from good to bad, is alloy 1, alloy 2 and alloy 3. With the same aging treatment, the fracture toughness of alloy 1 is better than that of alloy 2. Mo and V can enhance the cracks resistance, and then increase the fracture toughness, and the element Mo has better effect than V.
Key words: β titanium alloy; aging; precipitated phase; hardness; strength and toughness