两相钛合金热加工中初生带状α相形态演变（英文）

发布时间：2018-09-05 11:04

【摘要】：为实现钛合金初生带状α相的球化,以具有这种组织的TA15钛合金为对象,研究其在热加工中的组织演变。结果表明:带状α相形态演变的机理与片层组织球化机理相同。由于带状α相尺寸较大,界面分离和末端物质迁移机制较粗化更为重要。带状α相在退火中较为稳定,主要原因是:内部晶界的几何取向不利于球化、带状组织的宽度较大和α粒子几何稳定性高。预变形和低速变形通过以下方式加速球化:直接改变α相的几何形状、通过增加大角度晶界以及相界的面积促进界面分离和末端物质迁移、通过形成位错结构促进粗化。采用大预变形结合高温退火是球化带状α相的有效途径。
[Abstract]:In order to realize the spheroidization of primary banded 伪 phase of titanium alloy, the microstructure evolution of TA15 titanium alloy with this kind of microstructure was studied. The results show that the morphologic evolution mechanism of banded 伪 phase is the same as that of lamellar spheroidization. Because of the larger size of the banded 伪 phase, the mechanism of interface separation and terminal material migration is more important than that of coarsening. The band 伪 phase is stable in annealing mainly because the geometric orientation of grain boundary is not conducive to spheroidization, the width of band structure is larger and the geometric stability of 伪 particles is high. Pre-deformation and low-velocity deformation accelerate spheroidization by directly changing the geometry of 伪 phase, by increasing the area of large angle grain boundary and phase boundary to promote interface separation and terminal material migration, and by forming dislocation structure to promote coarsening. Large predeformation combined with high temperature annealing is an effective approach for spheroidized zonal 伪 phase.
【作者单位】：西北工业大学材料学院凝固技术国家重点实验室;
【基金】：Projects(51205317,51575449) supported by the National Natural Science Foundation of China Project(3102015AX004) supported by the Fundamental Research Funds for the Central Universities,China Project(104-QP-2014) supported by the Research Fund of the State Key Laboratory of Solidification Processing,China
【分类号】：TG146.23

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