Pan Di, Liu Bin, Xu Rongjun, Qiu Jingwen, Liu Chunxuan
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201, China.
Materials (Basel). 2021 Feb 9;14(4):836. doi: 10.3390/ma14040836.
A low-cost titanium alloy (Ti-5Al-2Fe-3Mo wt.%) was designed and fabricated by blended elemental powder metallurgy (BEPM) process. The high-temperature deformation behavior of the powder metallurgical Ti-5Al-2Fe-3Mo wt.% (PM-TiAlFeMo) alloy was investigated by hot compression tests at temperatures ranging from 700 to 1000 °C and strain rates ranging from 0.001 to 10 s. The flow curves were employed to develop the Arrhenius-type constitutive model in consideration of effects of deformation temperature, strain rate, and flow stress. The value of activation energy (Q) was determined as 413.25 kJ/mol. In order to describe the workability and predict the optimum hot processing parameters of the PM-TiAlFeMo alloy, the processing map has been established based on the true stress-true strain curves and power dissipation efficiency map Moreover, microstructure observations match well with the analyses about deformation mechanisms, revealing that dynamic recovery and dynamic recrystallization are dominant softening mechanisms at relatively high temperatures. However, the kinking and breaking of microstructure prefer to occur at relatively low temperatures.
通过混合元素粉末冶金（BEPM）工艺设计并制备了一种低成本钛合金（Ti-5Al-2Fe-3Mo重量百分比）。通过在700至1000°C的温度范围和0.001至10 s的应变速率下进行热压缩试验，研究了粉末冶金Ti-5Al-2Fe-3Mo重量百分比（PM-TiAlFeMo）合金的高温变形行为。考虑到变形温度、应变速率和流动应力的影响，利用流动曲线建立了Arrhenius型本构模型。确定激活能（Q）值为413.25 kJ/mol。为了描述PM-TiAlFeMo合金的加工性能并预测其最佳热加工参数，基于真应力-真应变曲线和功率耗散效率图建立了加工图。此外，微观结构观察结果与变形机制分析结果吻合良好，表明动态回复和动态再结晶是相对高温下的主要软化机制。然而，微观结构的扭折和破裂在相对低温下更容易发生。
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