TiNbZr合金在热处理过程中的微观组织和力学性能

Characterization of Microstructure and Mechanical Properties of TiNbZr Alloy during Heat Treatment

摘要:

TiNbZr合金由真空自耗电弧炉熔炼。研究了固溶，时效处理对该合金的微观组织和力学性能的影响。结果显示，当合金固溶处理1 h后在300和350 oC时效处理时，合金的抗拉强度高达1000 MPa。当固溶后的合金在400和450 oC时效处理时，出现α相。时效时间对α相的析出有重要的作用。当合金在400 oC时效处理9 h后，抗拉强度为850 MPa，延伸率也保持在11%左右

关键词:β钛合金;热处理;显微组织;力学性能

Abstract:

TiNbZr alloy was prepared by vacuum consumable arc melting furnace. The effects of solution and aging heat treatment on the microstructure and mechanical properties of this alloy were studied. The results show that ultimate tensile strength over 1000 MPa can be obtained when the alloy is solutioned for 1 h and then aged at 300 and 350 oC. α phase precipitation appears under the condition of the treatment of solution for 1 h, followed by aging at 400 oC and 450 oC. The aging time plays an important part in α phase precipitation. The ultimate tensile strength increases to 850 MPa and the elongation keeps around 11% when the alloy is aged at 400 ℃ for 9 h

Key words:β titanium alloys; heat treatment; microstructure; mechanical properties