中文摘要：

金属在高温热形变过程中,相变常常发生在形变过程中,塑性形变和相变同步进行。在此过程中,一方面相变的发生消耗了形变储存能,另一方面形变的发生又会造成新能量的积累和晶体缺陷的产生,能量状态、缺陷分布等和先形变后相变过程的不同,整个过程完全是动态的。围绕新型近α型钛合金—TA15钛合金的热压缩模拟试验,从介观角度出发,综合运用现代塑性加工学、金属学、金相学、有限元方法、晶体塑性理论、元胞自动机理论、计算机编程语言等多种理论和方法,对TA15钛合金在热压缩变形过程中发生的相变行为进行了系统研究,模拟了合金的相变过程,动态再现了相变发生时的微观组织的演变情况,建立了不同变形条件下的相变动力学方程。这对于合理制定变形过程中的热加工工艺方案,对钛合金的发展和实际应用的促进都具有极为重要的理论价值和实际意义。

英文摘要：

In the process of metal hot deformation,phase transformation often occurs during deformation,that is,plastic deformation and phase transformation synchronization both exist. In this process,the stored energy is consumed by phase transformation,while new energies are accumulated and crystal defects are generated by the plastic deformation,so the whole process of hot deformation in TA15 alloy is completely dynamic. Based on the test of hot compression and the theories of metal science,metallography,finite element method,crystal plasticity theory,cellular automata theory,computer programming language and other theories and methods,the phase transformation behavior of TA15 titanium alloy during hot compression deformation process was studied,the process of phase change was simulated dynamically,and the phase transition kinetics under different deformation conditions was established. It was of extremely important theory value and practical significance for making reasonable heat processing scheme of the deformation process and promoting the development and application of titanium alloys.