TA15钛合金热压缩变形位错演化分析
发布时间：2018-08-21 11:10
【摘要】：采用Gleeble—3500热模拟压缩试验机对TA15钛合金进行等温恒应变速率压缩实验,并应用材料分析测试技术(XRD与TEM)和相关定量计算理论(XRD线形傅氏分析法)分析其热压缩变形过程中的位错演化。结果表明,TA15钛合金热压缩变形过程中位错类型主要为柱面(1010)、基面(0002)、锥面(1011)和(110)β面位错,位错密度均在1013~1014 cm-2范围内。当变形温度为950℃且变形量为40%时,随着应变速率的提高,柱面(1010)和(110)β面位错密度几乎不变;当变形量升至60%时,随应变速率的提高,各晶面的位错密度均显著降低。当应变速率为1s-1时,随变形量的增加,平均晶格应变和位错密度均减小;当变形量为60%时,晶格应变降到0.116%~0.138%,位错密度减小到(1.1~1.7)×1014 cm-2。在(α+β)两相区出现了由位错形成的"微观变形带"及位错胞结构;在β单相区板条状马氏体α'相内部位错密度较低,形成位错塞积群,且在位错塞积群和马氏体α'相之间形成高度的应力集中。
[Abstract]:The isothermal constant strain rate compression experiment of TA15 titanium alloy was carried out by using Gleeble-3500 thermal simulation compression tester. The dislocation evolution during hot compression deformation was analyzed by material analysis and testing technique (XRD and TEM) and correlation quantitative calculation theory (XRD linear Fourier analysis). The results show that the dislocation types are mainly cylindrical (1010), base (0002), cone (1011) and 尾 (110) 尾 dislocations, and the dislocation density is in the range of 1013 ~ 1014 cm-2. When the deformation temperature is 950 鈩，
本文编号：2195532
[Abstract]:The isothermal constant strain rate compression experiment of TA15 titanium alloy was carried out by using Gleeble-3500 thermal simulation compression tester. The dislocation evolution during hot compression deformation was analyzed by material analysis and testing technique (XRD and TEM) and correlation quantitative calculation theory (XRD linear Fourier analysis). The results show that the dislocation types are mainly cylindrical (1010), base (0002), cone (1011) and 尾 (110) 尾 dislocations, and the dislocation density is in the range of 1013 ~ 1014 cm-2. When the deformation temperature is 950 鈩，
本文编号：2195532
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