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系统地研究了合金成分Al含量、拉应力和温度对Ti811合金棒材热稳定性能的影响,对合金的蠕变性能也进行了定性研究。结果表明:Al含量降低、应力和温度升高,则残余变形量增大;425℃/100h/410MPa热暴露,Al含量大于8(wt%)时,合金的热稳定性塑性急剧降低;不高于475℃暴露(0~475℃/100h/410MPa)以及425℃不同应力热暴露(0~490MPa/100h/425℃),合金具有较好的热稳定性。采用SEM和TEM技术分析了性能改变的原因。
The effects of Al content, tensile stress and temperature on the thermal stability of Ti811 alloy bar were investigated systematically. The creep properties of the alloy were also studied qualitatively. The results show that when the content of Al is decreased and the stress and temperature are increased, the residual deformation is increased. When the heat exposure of 425 ℃ / 100h / 410MPa and Al content is more than 8 (wt%), the thermal plasticity of the alloy decreases sharply; The alloy has good thermal stability at 475 ℃ exposure (0-475 ℃ / 100h / 410MPa) and 425 ℃ heat exposure at different stress (0 ~ 490MPa / 100h / 425 ℃). The causes of performance changes were analyzed using SEM and TEM techniques.