深冷处理对钛合金微观组织的影响研究  

Study on Effect of Cryogenic Treatment on Microstructure of Titanium Alloy

作　　者：刘东 王新 LIU Dong;WANG Xin(College of Mechanical and Material Engineering,North China University of Technology,Beijing 100144)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144

出　　处：《宇航材料工艺》2025年第1期98-102,共5页Aerospace Materials & Technology

摘　　要：为探究深冷处理对不同牌号的钛合金微观组织的影响,本文将TA7、TA6、TC4三种钛合金浸入液氮罐(-196℃)中进行深冷处理(DCT),分别利用电子显微镜(SEM)和X射线衍射仪(XRD)分析深冷处理前后的钛合金微观组织的变化情况。XRD分析结果表明:经深冷处理后,TA7和TC4衍射峰谱线强度有较大程度的增强,而实验前后TB6的衍射峰谱线强度变化不一,说明TA7和TC4试样内部发生明显的晶格偏转现象;三种材料的晶格间距在实验后均发生变化,说明晶粒大小发生变化。SEM分析结果表明:深冷处理均会细化三种材料的微观组织,致密性得到增强,同时TA7与TC4钛合金析出物数量更多。说明深冷处理可以有效优化钛合金的微观组织。In order to explore the effect of cryogenic treatment on the microstructure of different titanium alloys,three titanium alloys,TA7,TA6 and TC4,were immersed in liquid nitrogen tank(-196℃)for cryogenic treatment(DCT).Electron microscopy(SEM)and X-ray diffractometry(XRD)were used to analyze the microstructure changes of titanium alloys before and after cryogenic treatment.XRD analysis results show that the intensity of the diffraction peak lines of TA7 and TC4 is significantly increased after cryogenic treatment,while the intensity of the diffraction peak lines of TB6 before and after the experiment is different,indicating that obvious lattice distortion occurs in the samples of TA7 and TC4.The lattice spacing of the three materials changes after the experiment,indicating a change in grain size.The SEM analysis results show that the cryogenic treatment can refine the microstructure of all three materials and enhance their density.Additionally,the number of precipitates in the TA7 and TC4 titanium alloys increases.Therefore,cryogenic treatment can effectively optimize the microstructure of titanium alloy.

关 键 词：钛合金 微观组织 深冷处理 电子扫描 X射线衍射 

分 类 号：TG113.12[金属学及工艺—物理冶金]