摘要
在Ar保护条件下获得冷却速度为1、2、3、4和5℃/min的Mg-6Al和Mg-10Al合金,利用光学显微镜、扫描电镜、能谱分析和Imagetool软件研究慢冷对Mg-6Al和Mg-10Al合金晶粒尺寸以及β相分布特征与数量的影响。结果表明,Mg-6Al和Mg-10Al合金凝固组织由α-Mg相、点状和层片状析出β-Mg17Al12相以及棒状(α+β)共晶组成。随着冷速从5℃/min减小到1℃/min,Mg-6Al与Mg-10Al合金组织中α-Mg晶粒尺寸分别由195.7、180.4μm增至318.7、225.1μm,与此同时β-Mg17Al12相的数量分别由24.56%、45.50%降至18.36%、38.59%。
Mg-6Al and Mg-10Al alloys were prepared under the condition of Ar protection at the cooling rate of 1 ℃/min,2 ℃/min,3 ℃/min,4 ℃/min and 5 ℃/min.Influences of slow cooling conditions on grain size and distribution and quantity of β-phase in Mg-6Al and in Mg-10Al alloys were investigated by OM（optical microscope）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer） and Image tool.The results show that,solidification microstructure of Mg-6Al and Mg-10Al alloys is composed of α-Mg 、β-Mg17Al12 phases with pit-shape or lamellar-shape and rod-shaped（α＋β） eutectic structure.With the cooling rate decreasing from 5 ℃/min to 1 ℃/min,the grain size of α-Mg in Mg-6Al and in Mg-10Al alloys is increased from 195.7μm、180.4 μm to 318.7 μm、225.1 μm,respectively,and the quantity of β-Mg17Al12 phase is decreased from 24.56%、45.50% to 18.36% and 38.59%,respectively.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2012年第8期703-706,共4页
Special Casting & Nonferrous Alloys
关键词
镁铝合金
共晶组织
晶粒大小
Mg-Al Alloy, Eutectic Structure, Grain Size
