热处理工艺对紧固件用高强钛合金棒材的组织和性能的影响
Effect of Heat Treatment Process on Microstructure and Properties of Ti Alloy for Fasteners
罗媛媛, 赵永庆, 奚正平, 杜 宇
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作者单位：西北有色金属研究院, 陕西 西安 710016
中文关键字：Ti-26合金； 变形量； 显微组织； 力学性能
英文关键字：Ti-26 titanium alloy; deformation; microstructure; mechnical property
中文摘要：研究了紧固件用Ti-26合金棒材经80%变形后固溶态与时效态的显微组织和力学性能的变化规律。结果发现：不同的固溶温度决定Ti-26合金中β晶粒的大小，时效温度决定析出α相的形态与尺寸。时效后的组织中只有β相与针状α，其中析出相α处于中间湿润状态。固溶后合金的强度较低，但塑性最好；时效后的强度高，塑性相对较低。时效过程中随温度的升高，强度降低，塑性提高。断口分析说明，析出的α相降低了合金的塑性，其中伸长率受到的影响最大。
英文摘要：The microstructure and properties of Ti-26 alloy for fasteners were studied by TEM, SEM and X-Ray diffraction analysis when the deformation amount is 80%. The results show that the size of β grain is decided by the solution temperature, and the shape and size of α precipitated phase are decided by the aging temperature. The microstructure has only α and β phase, α phase is in an intermediate humid status after aging. The alloy has lower intensity after solution treatment, but the plastic is best. They have high strength and low ductility relatively after aging. With the aging temperature increasing, the intensity decreases and the plasticity enhances. Fractography analysis shows that the plasticity reduces especially because of the precipitation of α phase.