金属间化合物Ti2AlNb的高温变形行为和变形机理（英文）
发布时间：2018-07-22 15:17
【摘要】：对金属间化合物Ti2AlNb基合金在加热状态下的变形行为和变形机理进行研究。首先,利用单向拉伸试验得到不同温度和应变速率下合金的真应力-应变关系;然后,通过拉深和弯曲试样得到合金的极限拉深比(LDR)及弯曲性能参数;最后,通过金相实验和断口形貌分析研究Ti2AlNb基合金在不同加热条件下的高温变形机制。结果表明:在750~950℃、应变速率0.001 s~(-1)的条件下,随着温度的升高,合金的伸长率从13.58%增大至97.82%,屈服强度从788 MPa降低至80 MPa;当温度达到950℃时,应变速率对合金的变形性能有明显影响。同时,在该温度范围内,材料发生由O相向B2和α2相的组织转变,从微观组织演变揭示了Ti2AlNb基合金塑性提高的变形机理。
[Abstract]:The deformation behavior and mechanism of Ti _ 2AlNb based alloy under heating condition were studied. First, the true stress-strain relationship of the alloy at different temperatures and strain rates is obtained by uniaxial tensile test. Then, the ultimate drawing ratio (LDR) and bending performance parameters of the alloy are obtained by drawing and bending specimens. The deformation mechanism of Ti _ 2AlNb based alloy at high temperature under different heating conditions was studied by metallographic test and fracture morphology analysis. The results show that the elongation of the alloy increases from 13.58% to 97.82 at 750 鈩，
本文编号：2137880
[Abstract]:The deformation behavior and mechanism of Ti _ 2AlNb based alloy under heating condition were studied. First, the true stress-strain relationship of the alloy at different temperatures and strain rates is obtained by uniaxial tensile test. Then, the ultimate drawing ratio (LDR) and bending performance parameters of the alloy are obtained by drawing and bending specimens. The deformation mechanism of Ti _ 2AlNb based alloy at high temperature under different heating conditions was studied by metallographic test and fracture morphology analysis. The results show that the elongation of the alloy increases from 13.58% to 97.82 at 750 鈩，
本文编号：2137880
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