摘要
采用不同的冷却方式获得了两种状态的Mg-Nd-Pr合金,利用电子探针、透射电子显微镜、X射线衍射分析仪等设备,系统分析了相应合金的显微组织和相结构。证明急冷的方法可以大幅度减小晶粒尺度,形成单相的过饱和α-Mg(Nd、Pr)固溶体,能够显著提高Mg-Nd-Pr合金的力学性能,Mg-Nd-Pr合金通过固溶强化能获得较高的强度。室温下Nd、Pr元素在α-Mg中的固溶度很小,缓慢冷却会导致合金元素在晶界析出,缓冷合金由α-Mg、Mg41Nd5和Mg12Pr等相组成,Mg41Nd5和Mg12Pr分布于α-Mg的晶界处,同时在α-Mg晶粒内部产生孪晶。
Two Mg-Nd-Pr alloys were prepared adopting different cooling methods, and the microstructural characteristics and phase structure of both alloys were examined by transmission electron microscopy （TEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that the crystalline grain size is decreased greatly under the condition of melt-spin, the supersaturated α-Mg solid solution is developed, and the mechanical properties of Mg-Nd-Pr alloy are increased remarkably. The alloying elements will precipitate along the grain boundaries in a state of slow cooling owing to lower solubility for Nd, Pr in α-Mg phase at room temperature. The phase composition of such alloy includes α-Mg, Mg41Nd5 and Mg12Pr. Mg41Nd5 and Mg12Pr are distributed in the grain boundaries. At the same time, many twins within the grains are observed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第4期677-680,共4页
Rare Metal Materials and Engineering
基金
吉林省杰出青年基金(20030128)
吉林省工业引导项目(20030331)
