摘要
运用SEM和TEM等分析手段研究了TiAl+Ca三元合金的室温断裂行为和变形亚结构.结果表明,少量Ca的添加可以大幅度提高Ti-34%Al合金的室温力学性能.合金断裂时不再表现为单纯的穿晶解理断裂而在γ单相中出现了河流状的解理纹,断口上还出现较多的撕裂梭;TEM分析表明,Ca的添加有助于1/2<110]正常位错的启动;Ti-34%Al-1.0%Ca合金压缩变形时产生大量的位错环,当Ca含量达到2.0%时,在γ相中出现了由于位错分解而产生的层错.
The fracture behaviors and deformation substructures of TiAl+Ca alloy were investigated using SEM and TEM. The results show small Ca additions to Ti-34%Al can improve remarkedly its mechanical properties at ambient temperature. The fracture mode is a mixed mode, including transgranular cleavage and 'river' pattern in gamma single phase. A lot of tear ridges can be found in the fractured surfaces. TEM results indicate Ca additions can enhance the activity of ordinary unit dislocation 1/2 <110]. Dislocation loops in Ti-34%Al-1.0%Ca alloy and stack faults resulting from superdislocation dissociation in Ti-34%Al-2.0%Ca alloy, were observed.
出处
《中南工业大学学报》
CSCD
1996年第6期703-706,共4页
Journal of Central South University of Technology(Natural Science)
基金
国家自然科学基金
国家"八六三"高技术研究计划资助