摘要
采用金相显微镜、X射线衍射仪、扫描电镜和电子万能试验机等手段,研究了T6处理(固溶+时效)对ZA52-xNd镁合金显微组织、断口形貌及力学性能等影响。试验结果表明:与铸态相比,ZA52镁合金经335℃×16h+175℃×12h热处理后,随着Nd含量的增加合金的抗拉强度呈现与之相同的变化趋势(先上升后下降),但是抗拉强度较铸态有明显提高,而伸长率有所下降。当合金中添加0.6%Nd时,抗拉强度和伸长率均达到最大值,分别为233MPa,7.125%。经过时效处理后,合金中的τ-Mg3(2Al,Zn)49相沿晶界连续或不连续析出,起到了晶界强化和弥散强化的作用。
The microstructure,mechanical properties and fracture modes of ZA52-xNd magnesium alloy after T6 heat-treatment （including solution and aging treatmen）t were observed and analyzed by metallographic microscope,X-Ray diffraction,electronic universal materials testing machine and scanning electron microscopy （SEM）. The results show that compared with as-cast alloy,the tensile strength of ZA52-xNd magnesium alloy,after T6 heat treatment of solid solution at 335 ℃ for 16 h and followed the aging at 175 ℃ for 12 h,with the increasing of Nd content,take on the same trend of increasing first and then descending. The tensile strength was improved obviously,but the elongation was decreased. When the addition of Nd is 0.6%,both the optimaltensile strength and elongation were obtained,i.e. 233 MPa and 7.125%,respectively. Meanwhile after the aging treatment,the τ-Mg3（2Al,Zn）49 phase is precipitated from the grain-boundary continuously or discontinuously,operating the functions ofsolution strengthing and dispersion strengthening.
出处
《铸造》
CAS
CSCD
北大核心
2010年第7期717-720,共4页
Foundry
关键词
ZA52镁合金
固溶处理
时效处理
显微组织
力学性能
ZA52 magnesium alloy
solution treatment
aging treatment
microstructure
mechanical properties
