(1. 西部金属材料开发有限公司，西安 710016；
2. 西安赛特金属材料开发有限公司，西安 710016)
摘 要: 通过真空自耗熔炼制备的TC4合金铸锭，经开坯锻造后，终锻成棒坯并机加工成挤压管材用坯料，随后在不同工艺条件下挤压，以获得球形气瓶用具有细晶组织特征的超塑性TC4合金管材。研究了工艺参数对挤压管材的组织及力学性能的影响。结果表明：对挤压前的坯料在1 050 ℃进行β固溶预处理，然后在950 ℃对两相区挤压，可获得晶粒尺寸达5~10 μm的细晶组织，管材超塑性拉伸伸长率达600%~900%，有效地保证了球形气瓶的超塑性成型。
关键字: 球形气瓶；TC4钛合金；挤压管材；超塑性
（1. West Metal Materials Co., Ltd., Xi’an 710016, China;
2. Xi’an Saite Metal Materials Co., Ltd., Xi’an 710016, China）
Abstract:VAR was applied to preparing TC4 alloy ingot, then ingot was forged into bar and extruded with fine-grain characteristics of superplastic TC4 alloy pipes under different processing conditions. The effects of processes on microstructure and mechanical properties were investigated. Results show that 5−10 μm grain size of extruded pipe can be obtained by β solution at 1 050 ℃ and extruding at 950 ℃, which reveals excellent superplastic elongation of 600%−900%. The superplastic formation of spherical gas bottle is ensured effectively.
Key words: spherical gas bottle; TC4 alloy; extruded pipe; superplasticity
