通过在830℃空气中保温1h后水冷的热处理工艺,在Ti-10V-2Fe-3Al(Ti1023)钛合金表面形成厚度约为82 μrn的α富氧复合层.研究了α复合层内显微组织形貌、硬度及元素分布特点及复合α层后对Ti1023合金组织和性能影响.结果表明:α复合层从边缘到基体内部硬度值并非一直减小,而是呈现高-低-高-低-趋于稳定的变化规律.研究表明硬度变化规律与合金元素(尤其V、Fe)及组织形态分布相关.Ti 1023合金试样复合α层后表面硬度增加了45％,而屈服强度和抗拉强度下降5％.在拉伸变形过程中,复合α层后试样首先会在垂直于拉伸应力方向的外表面产生裂纹,之后裂纹扩展穿过α层到基体内部直至试样断裂,试样拉伸断口呈现心部韧性断裂和边部脆性断裂特征.拉伸过程中试样内部存在应力诱发β相向α”相的组织转变.
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