朱凯,冯艾寒,曲寿江,沈军.铸态Ti–44Al–4Nb–(Mo, Cr, B)合金的热变形行为及热加工图[J].有色金属工程,2019,9(9):.
铸态Ti–44Al–4Nb–(Mo, Cr, B)合金的热变形行为及热加工图
Hot deformation behavior and processing maps of as-cast Ti–44Al–4Nb–(Mo, Cr, B) alloy
投稿时间:2019-07-04  修订日期:2019-07-14
DOI:
中文关键词:  TiAl基合金  热压缩  动态再结晶  变形机制
英文关键词:TiAl-based alloy  hot compression  dynamic recrystallization  deformation mechanism
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
           
作者单位
朱凯 同济大学 材料科学与工程学院
冯艾寒 同济大学 材料科学与工程学院
曲寿江 同济大学 材料科学与工程学院
沈军 同济大学 材料科学与工程学院
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中文摘要:
      利用Gleeble热模拟机研究了铸态Ti–44Al–4Nb–(Mo, Cr, B)合金在1050-1200 ℃,0.005-0.5 s-1下的热变形行为,并基于所得的真应力-真应变曲线绘制了热加工图。另外,通过透射电子显微镜(TEM)研究了片层和γ相的变形机制。结果表明,该合金是典型的应变速率和温度敏感材料,它的热加工性能较好,在1100、1150 ℃温度下的低应变速率区域以及1200 ℃温度下高应变速率区域比较适合热加工。再结晶是流变软化的主要原因,较高的变形温度和较低应变速率有利于再结晶晶粒的进行。片层结构的变形机制为片层扭折,而γ相的主要变形机制为位错滑移和变形孪晶。
英文摘要:
      The hot deformation behavior of as-cast Ti–44Al–4Nb–(Mo, Cr, B) alloy at 1050-1200 °C and 0.005-0.5 s-1 was investigated by Gleeble thermal simulator. The processing map is plotted on the base of the true strain–stress curves. In addition, the deformation mechanism of the lamellae and γ phase was investigated by transmission electron microscopy (TEM). The results show that the alloy is a typical strain rate and temperature sensitive material, and it has good hot workability. It is suitable for processing in the low strain rate region at 1100 °C and 1150 °C and the high strain rate region at 1200 °C. Recrystallization is the main softening mechanism during hot deformation, and higher deformation temperature and lower strain rate are beneficial for recrystallization. The deformation mechanism of the lamellar structure is kinking, and the main deformation mechanism of the γ phase is dislocation slip and twinning.
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