论文部分内容阅读
采用搅拌摩擦加工技术对含铁3%(质量分数)铸态铝铁合金进行3道次往复搅拌摩擦加工,研究加工区显微组织和力学性能的变化。结果表明,铸态铝铁合金经搅拌摩擦加工后,粗大的针状Al3Fe相被破碎成细小粒状,铸态组织转变成低位错密度的再结晶组织,且基体中存在细小的含铁亚稳相。搅拌摩擦加工后,加工区的显微硬度较铸态区降低,但分布比较均匀;加工区合金的抗拉强度稍微下降,延伸率显著增大。经搅拌摩擦加工后,合金拉伸断口呈现出微孔聚合韧性断裂特征。
The 3-times-repeated friction stir processing of 3% (mass fraction) iron-aluminum alloy containing iron with friction stir processing technology was carried out to study the changes of the microstructure and mechanical properties in the processing zone. The results show that the coarse acicular Al 3 Fe phase is crushed into small grains after the as-cast Al-Fe alloy is subjected to friction stir processing. The as-cast structure is transformed into a recrystallized structure with low dislocation density, and the fine iron-containing metastable phase exists in the matrix. After the friction stir processing, the micro-hardness of the processing zone is lower than that of the as-cast zone, but the distribution is relatively uniform; the tensile strength of the alloy in the processing zone slightly decreases and the elongation increases significantly. After the friction stir processing, the tensile fracture of the alloy shows the characteristics of microporous polymeric ductile fracture.