采用XRD、TEM等手段对Ti-24Nb-4Zr-8Sn(质量分数,%)合金中温旋锻变形后的显微组织进行研究.结果表明,经过较大的中温变形后,合金呈旋涡状大理石花纹组织且具有与旋锻轴向平行的强烈的á110?丝织构,这种典型的组织是由于具有á110?取向的晶粒在轴向拉应力状态下发生平面应变所致.TEM分析显示组织中含有高密度的小角晶界,应变分布不均匀.旋锻变形后,合金具有3.3%的超弹性变形和微弱的加工硬化行为.由于变形组织中留有大量的分布不均匀的残余应力,合金的塑性较差,在600 ℃下5 min去应力退火处理后,合金的塑性增强.
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