【摘 要】
：
采用退火工艺对Ti-6Al-4V合金进行了910～1000℃温度下的热处理试验,获得了该合金不同热处理温度下α和β的相比例、晶粒尺寸的变化规律.在AG 250KNE型拉伸试验机上对不同热处
【机 构】
：
沈阳工业大学材料科学与工程学院,辽宁沈阳110870;上海航天精密机械研究所,上海201600
论文部分内容阅读
采用退火工艺对Ti-6Al-4V合金进行了910～1000℃温度下的热处理试验,获得了该合金不同热处理温度下α和β的相比例、晶粒尺寸的变化规律.在AG 250KNE型拉伸试验机上对不同热处理状态下的试样进行超塑性拉伸试验,分别得到了该合金在温度为800℃,应变速率为5×10-3、10-3和5×10-4 s-1时的真应力-应变曲线,计算了该合金不同热处理工艺下的应变速率敏感性指数m值,揭示了α和β的相比例在超塑性变形过程中的调节作用.结果 表明:该合金经过退火处理后,其伸长率显著提高.当α和β的相比例接近50％,晶粒尺寸约为19.35 μm时,其超塑性伸长率达到最大值,为867％.
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