摘要
研究Mg-38%Cu过共晶合金的凝固组织中初生α-Mg相的形成机制。结果表明,Mg-38%Cu过共晶合金凝固组织由α-Mg相和β-Cu Mg2相两种初生相和(α+β)共晶组成,少量的初生β-Cu Mg2相和α-Mg相分布在共晶基体上。初生α-Mg相是非平衡凝固过程中枝晶α-Mg相和共晶相之间竞争生长的结果,α-Mg相是一种非平衡凝固过程的典型产物,(α+β)共晶是偏离平衡共晶成分的伪共晶组织,随着冷却速率的增加,β-Cu Mg2相的尺寸减小,形貌没有发生本质的变化,而α-Mg相数量有所增加。
The forming mechanism of the primary α-Mg phase in solidified microstructure of Mg-38% Cu hypereutectie alloy is investigated. The results show that the microstructures of the hypereuctic Mg- 38% Cu alloy consist of the primary α-Mg phase, β-CuMg2 phase and the eutectic （α＋β）, the little primary α-Mg phase and β-CuMg2 phase are distributed in the eutectie matrix. The formation of α-Mg phase in the hypereutectic Mg-38% Cu alloy is the outcome of the competition growth between α-Mg phase and eutectic （α ＋β） during the non-equilibrium solidification process. The α- Mg phase is the typical non-equilibrium microstructure and the eutectic （α ＋β） is the pseudo-eutectic structure deviating from the equilibrium composition. With the increase of cooling rate, the size of the β-CuMg2 phase is decreased, but its morphology is not change, and the quantity of the α- Mg phase is increased.
出处
《有色金属工程》
CAS
CSCD
北大核心
2015年第3期5-9,共5页
Nonferrous Metals Engineering
基金
陕西省科技厅基金资助项目(2011JE009)
陕西理工学院校级项目(slgky13-49)
