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Dy-Mn-Ni三元系合金相图530℃等温截面
THE 530 ISOTHERMAL SECTION OF THE PHASE DIAGRAM OF Dy-Mn-Ni TERNARY SYSTEM
【作者】 欧晓斌;
【作者基本信息】 广西大学 , 凝聚态物理, 2002, 硕士
【摘要】 本文用X射线衍射分析法、差热分析法、金相分析法、——和扫描电镜等技术对Dy—Mn-Ni三元系合金相图530℃等温截面进行了研究。研究结果表明此截面由13个单相区、22个两相区和10个三相区组成。 13个单相区是:和的连续固溶体, 22个两相区是: 10个三相区是: 本实验XRD分析结果证实了11个二元化合物Dy2Ni山,DyNi5,Dy2Ni,,DyN乙DyNi:,DyNi,Dy,,Ni 2,Dy3Ni,DyMn2,Dy6Mn2,and DyMn,:的存在。在我们的实验条件下,既没有观察到二元化合物DyNi:和Dy4N山的存在,也没有发现新的三元化合物。在530℃,锰和镍没有形成二元化合物。 在530℃时,Mn在Ni,Dy2N山,DyNis,Dy2Ni,.DyNi,.DyNi,Dy3Ni:和Dy3Ni等相中的最大固溶度分别约为31at.%Mn,6at.%Mn,5.5at.%Mn,3 at.%Mn,5 at%Mn,5 at.%Mn,3 at.%M和1.5 at.%Mn,Ni在Mn,DyMn,:和Dy6Mn2,等相中的最大固溶度分别约为2.6 at.%Ni,2 at.%Ni 广西大学硕土学位论文 和 4 at.%N i 在 530‘C,DvMn。禾 Dvm。形成 T连续固溶体 B(Dvu。Mn。N i砧卜x; X二0、66.7)。
【Abstract】 The 530 isothermal section of the phase diagram of Dy-Mn-Ni ternary system has been investigated by X-ray powder diffraction, DTA, optical microscopy and scanning electron microscopy teckniques. It consists of 13 single-phase regions, 22 two-phase regions and 10?three-phase regions.The 13 single-phase regions are: ot(Dy), x(Mn), ? (Ni),5[B: (DyMn2-DyNi2)], e(Dy6Mn23), O (DyMn,2), y(Dy3Ni), T,(Dy3Ni2), v (DyNi), K(DyNi3), X (Dy2Ni7), u(DyNi5) and I (Dy2Ni,7).The 22 two-phase regions are : a+y, y+T|, TI+VI v+8i 5+K, K+X,, +p, p+x?5, a+5, 5+v,5-H/, 8+n,e+K, and ?%.The 10 three-phase regions are : +p,, , A.+E+K, 5+s+K, 6+v+T|, y+T|+8 and y+5+a. The XRD results confirm that 11 binary compounds, namely Dy2Ni,7,DyNi5, Dy2Ni7 , DyNi3, DyNi2, DyNi , Dy3Ni2 ,Dy3Ni , DyMn2,Dy6Mn23 and DyMni2,exist in this ternary system.Under our present experimental condition, the existence of the compounds DyNi4 and Dy4Nii7 was not observed in Dy-Ni system. The existence of the compounds DyNi4 and Dy4Nii7 was not observed in this ternary system, either. No ternary compound was discovered. Manganese and nickel don’t form intermetallic compounds at 530?C.At 530,the maximum solid solubilities of Mn in Ni, Dy2Nii7, DyNi5 , Dy2Ni7, DyNi3, DyNi, Dy3Ni2 and Dy3Ni are about 31 at. % Mn, 6 at.% Mn, 5.5 at. % Mn, 3 at. % Mn, 5 at % Mn, 5 at.% Mn, 3 at.% Mn and 1.5 at.% Mn, respectively. The maximum solid solubilities of Ni in Mn , DyMn^ and Dy6Mn23 are about 2.6 at.% Ni, 2 at.% Ni and 4 at % Ni, respectively.DyMn2 and DyNi2 form a continous solid solution B: ( DyMn2-DyNi2) at 530?C in this system.
【Key words】 Dy-Mn-Ni ternary system; isothermal section; phase diagram; solid solution;
- 【网络出版投稿人】 广西大学 【网络出版年期】2002年 02期
- 【分类号】TG113.14
- 【下载频次】75