(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 材料科学与工程学院，西安 710072)
摘 要: 利用光学显微镜(OM)、扫描电镜(SEM)对合金微观组织进行分析，并结合室温力学性能测试研究了热处理温度对TC11锻件微观组织和力学性能的影响。结果表明：升高第一阶段的退火温度，等轴α数量减少，条状α增加，从而大幅度降低合金塑性；第二阶段时效温度的升高使得等轴α相转变为长条状，增加了初生α相颗粒间距，这有利于降低次生α相缺口敏感性，从而提高材料的塑性和韧性。通过合理的双重热处理温度控制，可得到强韧性最佳匹配的合金组态。
关键字: TC11钛合金；高应力水平锻件；双重退火；强韧性匹配
mechanical properties of TC11 alloy
（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:Through the detection of mechanical properties and microstructure analysis by optical microscope and SEM, the influence of variant heat treatment processing (two-stage annealing) on the mechanical properties and the microstructure of the TC11 titanium alloy large forgings was investigated. The results show that increasing the annealing temperature of the first stage is harmful to the alloy plasticity, due to reduced content of equiaxed α-phase and increased content of stripy α-phase. However, increasing secondary ageing temperature promotes the equiaxed α-phase transforming into stripy α-phase, resulting in good plasticity and toughness. The best alloy microstructure of plasticity and durability matching can be obtained by choosing double annealing temperature parameters simply and resonably.
Key words: TC11 alloy; forgings bearing high stress; double annealing; strengthening and toughening matching
