CAJ | 학술논문

研究添加不同含量Zn对铸态Mg-2Dy(摩尔分数，%)合金显微组织、时效行为和力学性能的影响。结果表明：Zn 含量为0.5%和1%(摩尔分数)时，铸态合金中分别析出片层状具有18R 类型长周期有序(LPSO)结构的Mg12ZnDy相和粗大的Mg3Zn3Dy2相；同时，Zn的添加细化了合金的晶粒；固溶处理后，LPSO相由18R类型转变成沿晶内分布的细条状的14H类型，新的(Mg, Zn)xDy相形成，且Mg3Zn3Dy2相的体积分数减小；添加0.5%Zn有效地增强了合金的时效硬化行为，提高了合金的室温和200℃的拉伸强度。
연구첨가불동함량Zn대주태Mg-2Dy(마이분수，%)합금현미조직、시효행위화역학성능적영향。결과표명：Zn 함량위0.5%화1%(마이분수)시，주태합금중분별석출편층상구유18R 류형장주기유서(LPSO)결구적Mg12ZnDy상화조대적Mg3Zn3Dy2상；동시，Zn적첨가세화료합금적정립；고용처리후，LPSO상유18R류형전변성연정내분포적세조상적14H류형，신적(Mg, Zn)xDy상형성，차Mg3Zn3Dy2상적체적분수감소；첨가0.5%Zn유효지증강료합금적시효경화행위，제고료합금적실온화200℃적랍신강도。
The effects of Zn addition on the microstructure, aging behavior and mechanical properties of as-cast Mg-Dy alloy were investigated. The results show that the lamellar Mg12ZnDy phase with a 18R-type long period stacking ordered (LPSO) structure and coarse Mg3Zn3Dy2 phase precipitate in the alloy, respectively, when 0.5%and 1%(mole fraction) Zn are added. Simultaneously, the grains of the alloy are refined with increasing Zn content. After solution heat treatment, the 18R-type LPSO phase transforms to a strip-like 14H-type LPSO structure distributing in the grain interior. In addition, the (Mg, Zn)xDy phase forms and the volume fraction of Mg3Zn3Dy2 phase decreases. 0.5% Zn addition improves the aging behavior and strengthens the tensile strengths at room temperature and 200 ℃.