摘要
Microstructure refinement of a dual phase titanium alloy, Ti-3AI-4.5V-5Mo, by severe room temperature compression was investigated. Nanocrystalline grains were observed in the sample with 75% reduction, in which the grain sizes of a phase and β phase were approximately 50 and 100 nm. Conversely, the average thicknesses of a phase and β phase in as-received microstructure were measured to be 0.7 and 0.5 μm, respectively. TEM and XRD methods were used to analyze the microstructure and texture changes after severe deformation. Microstructure refinement was deduced to the complex interaction among slip dislocations in the a phase, the complex interaction among slip dislocations and martensites in the β phases. In addition, the interaction between the a phase and the β phase also contributed to the microstructure refinement.
研究了室温大压缩变形下双相Ti-3Al-4.5V-5Mo钛合金的组织细化。原始片层组织中α相和β相的平均宽度分别为0.7和0.5μm;当压下量达到75%时,在α相和β相中均发现了纳米晶,晶粒尺寸分别约为50和100nm。采用TEM和XRD对大压缩变形后的显微组织和织构变化进行分析。结果表明,α相中滑移位错间的交互作用、β相中滑移位错间及与应力诱发马氏体的复杂作用是显微组织细化的原因。此外,α相和β相之间的相互作用对于晶粒细化有影响。
