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PHASE DIAGRAM OF PrCl_3-SrCl_2-CaCl_2 SYSTEM

ZHENG Chaogui BAO Chenglin QIAO Zhiyu YE Yupu Peking University , Beijing , China 1 University of Science and Technology Beijing , Beijing , China Associate Professor , Department of Chemistry , Peking University , Beijing 100871 , China

金属学报(英文版)

Five fields corresponding to the primary crystallization of PrCl_3,Sr_3PrCl_9,α(SrCl_2, CaCl_2),α_1(CaCl_2,SrCl_2)and α_2(SrCl_2,CaCl_2)respectively,six univariant lines related to the secondary crystallization,one ternary eutectic(48.0 wt-% PrCl_3,23.5 wt-% SrCl_2; 590℃)and ternary peritectic point(45.5 wt-% PrCl_3,24.5 wt-% SrCl_2;614℃) were determined by DTA.Attempts were also made to explore the rule governing the alteration in the phase diagram containing rare earth chloride,formation of compound and its stability by means of polarization and counter-polarization.

关键词: PrCl_3 , null , null , null

PHASE DIAGRAM OF TERNARY SYSTEM PrCl_2-CaCl_2-MgCl_2

ZHENG Chaogui LIU Hongping YE Yupu(Y.P.Yeh) Peking University , Beijing , ChinaQIAO Zhiyu University of Science and Technology Beijing , Beijing , China ZHENG Chaogui Dept.of Chemistry , Peking University , Beijing 100871 , China

金属学报(英文版)

Three surfaces corresponding to the primary crystallization of PrCl_3,CaCl_2 and MgCl_2 respectively,3 univariant curves related to the secondary crystallization and a ternary eutectic(44.8 wt-% PrCl_3,31.8 wt-% CaCl_2,546℃)were found in system PrCl_3-CaCl_2-MgCl_2 by means of DTA.A reaction occurs in this system: L=PrCl_3+CaCl_2+MgCl_2.

关键词: PrCl_3-CaCl_2-MgCl_2 , null , null

SURFACE SEGREGATION IN Mo-La ALLOY WIRE

HU Deqing ZHANG Zhaoxiang ZHAO Xingyu Peking University , Beijing , China ZHZNG Zhaoxiang , Dept.of Radio Electronics , Peking University , Beijing 100871 , China

金属学报(英文版)

The surface segregation in Mo-4wt-% La alloy wire has been studied by using Auger elec- tron spectroscopy.The process of the segregation is that the La atoms diffuse from the grain boundaries to surface.The experimental results were analysed by kinetics of grain boundary diffusion.The diffusion activation energy E_(?)=1.6 eV was obtained.

关键词: surface segregation , null , null , null

INTERACTION BETWEEN Cu AND LIQUID Sn—Also on Physical Meaning of Wetting Curve

ZHANG Qiyun HAN Wanshu LIU Junkang Peking University , Beijing , China ZHANG Qiyun Professor , Dept.of Chemistry , Peking University , Beijing 100871 , China

金属学报(英文版)

The interaction between Cu and liquid Sn was studied by microstructure observation.The curve of the dipping time with related to dissolving and diffusion of Cu in liquid Sn is given. The Cu dissolves rapidly in liquid Sn at the beginning,then an intermetallic compound Cu_6Sn_5 forms,and the dissolving follows to slow down.At temperature up to 350℃,the hard feather-like Cu_6Sn_5 is sharply growing up and speads through the dipped Sn laver.The way to inhibit the growth of the intermetallic compound Cu_6Sn_5 was also approached.Thus,on the above mentioned basis,the physical meaning of the wetting curve traced by the meniscograph wettability tester has been derived as film detaching,Cu dissolying and Cu_6Sn_5 growing.

关键词: Cu , null , null , null , null

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