采用显微组织观察的方法研究了Ti-Al-Nb-W-B合金在1265℃,18h热处理过程中的组织演变规律.对合金的铸态、均匀化处理态合金及1265℃,18 h热处理态微观组织进行了观察,研究了钨含量与Ti-Al-Nb-W-B合金热处理微观组织演变的关系.结果表明:热处理态组织的层片特征弱化,γ片增厚,而体积分数减少,α2片则增厚更多,且体积分数增多.当合金中钨含量不同,其组织中的晶团尺寸出现差异,随着钨含量的增加,晶团尺寸减小,但减小的程度较小;白色点状的β(B2)相析出,呈弥散分布;随着钨含量的增加,β(B2)析出相的数量有增加的趋势,且更多地分布在晶界,尤其在晶界的交角处,析出相可有效钉扎晶团长大:在1265℃保温时,非连续长大非常缓慢.
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