Evolution of Deformation Substructure and Mg_(x)Zn_(y)Ca_(z)Metastable Phase in Fine-Grained Mg Alloys  

作　　者：Zhen-Liang Li Xin-Lei Zhang 

机构地区：[1]School of Materials Science and Engineering,Inner Mongolia University of Science&Technology,Baotou,014010,China [2]Inner Mongolia Key Laboratory of New Metal Material,Baotou,014010,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第1期71-85,共15页金属学报(英文版)

基　　金：financial support by the National Natural Science Foundation of China(No.51364032);the Inner Mongolia Natural Science Foundation(No.2022MS05028)。

摘　　要：The spray-deposition was used to produce billets of Mg-4Al-1.5Zn-3Ca-1Nd(A alloy)and Mg-13Al-3Zn-3Ca-1Nd(B alloy),and evolution of deformation substructure and Mg_(x)Zn_(y)Ca_(z)metastable phase in fine-grained(3μm)Mg alloys was investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and electron backscattered diffraction(EBSD).It was found that different dislocation configurations were formed in A and B alloys.Redundant free dislocations(RFDs)and dislocation tangles were the ways to form deformation substructure in A alloy,no RFDs except dislocation tangles were found in B alloy.The interaction between nano-scale second phase particles(nano-scale C15 andβ-Mg_(17)(Al,Zn)_(12)phase)and different dislocation configurations had a significant effect on the deformation substructures formation.The mass transfer of Mg_(x)Zn_(y)Ca_(z)metastable phases and the stacking order of stacking faults were conducive to the Mg-Nd-Zn typed long period stacking ordered(LPSO)phases formation.Nano-scale C15 phases,Mg-Nd-Zn typed LPSO phases,c/a ratio,β-Mg_(17)(Al,Zn)_(12)phases were the key factors influencing the formation of textures.Different textures and grain boundary features(GB features)had a significant effect on k-value.The non-basal textures were the main factor affecting k-value in A alloy,while the high-angle grain boundary(HAGB)was the main factor affecting k-value in B alloy.

关 键 词：Deformation substructures Metastable phase Textures K-VALUE Fine-grained Mg alloys 

分 类 号：TG1[金属学及工艺—金属学]