宁远涛
,
周新铭
,
戴红
金属学报
采用锤—砧技术制备了厚0.04—0.06mm快速凝固Al—RE(RE=Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Er,Yb)合金箔试样,冷却速度达10~6K/s,用点阵参数法测得上述稀土元素在Al中亚稳扩展固溶度分别为0.4,0.15,0.21,0.21,0.3,0.5,0.1,0.6,0.65,0.7,0.75和0.2at.—％测定了Al—轻稀土(包括Eu)系中第二相是Al_4RE;Al—重稀土(包括Y)系中第二相是Al_3RE,原子尺寸因素是控制RE在Al中固溶度亚稳扩展的主要因素。
关键词:
快速凝固
,
solid solubility
,
Al-RE alloy
宁远涛
贵金属
总结了周期表元素与Pd的相互作用，按富Pd合金的相图特征，采用经典合金化理论和米德玛键参数分析了固溶度的规律性。建立了周期表元素在 Pd 中的溶解度方程：lnCmax =4.6052–k(|?nws1/3|–nR)，溶质在Pd溶剂中的极限固溶度(lnCmax)是Pd溶剂与溶质之间的电子密度差|?nws1/3|的减函数。当Pd溶剂与溶质之间的电子密度差|?nws1/3|相同时，简单金属溶质在Pd中的固溶度大于过渡金属溶质，简单金属和过渡金属溶质在 Pd 溶剂中具有不同的固溶机制。分析了惣各贵金属元素作为溶剂对周期表元素的溶解能力指数与溶质元素电子密度nws1/3的关系，Pd作为溶剂对周期表元素具有最大溶解能力。
关键词:
金属材料
,
合金化原理
,
固溶度
,
米德玛键参数
,
溶解度方程
王希林
,
赵永杰
,
赵玉珍
,
贾志东
,
周和平
人工晶体学报
通过陶瓷烧结工艺研究了Ba0.6Sr04(Zr0.2SnxTi0.8-x)O3材料.性能测试结果表明,该固溶体是一种优异的可调材料,当x =0.03时,在1.5 kV/mm电场下,介电常数低于2000,可调性达到27.9％,介电损耗低至0.00010(100kHz,室温).XRD结果显示该固溶体是典型的钙钛矿结构.
关键词:
钛酸锶钡陶瓷
,
固溶度
,
可调性
NING Yuantao ZHO U Xinming LI Yongnian Kunming Institute of Precious Metals
,
Kunming
,
China
金属学报(英文版)
The 0,05—0.08 mm thick splat foils of Ag-Tb alloy,containing Tb up to 10 at.-%,were made by the hammer-anvil technique.The cooling rate was in order of 10~6 K/s.The metastable extension of solid solubility of Tb in the alloy was measured to be up to 5 at.-% by lattice parameter method.The secondary phase in metastable eutectic structure was identi- fied as Ag_3Tb from diffraction pattern.The microstructure and micro-defect in as-quenched Ag-Tb splat foil were also observed.
关键词:
rapid solidification
,
null
,
null
NING Yuantao ZHOU Xinming DAI Hong Institute of Precious Metals
,
Kunming
,
Yunnan
,
China
金属学报(英文版)
The splat folis of Al-RE(RE=Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Er and Yb) binary alloys of 0.04—0.06 mm thickness were made by are-melting and hammer-anvil technique,the.cooling rate is in 10~6 K/s order of magnitude.The metastable extended solid solubilities of these RE elements have been evaluated by measurements of the lattice spacings of the rapidly solidified(RS)Al-RE alloys,they are 0.4,0.15,0.21,0.21,0.3, 0.5,0.1,0.6,0.65,0.7,0.75,0.2 at.-% for above individual RE clements,respectively.The secondary phase in RS Al-RE alloys were identified to be Al_4RE for alloys containing light RE and Eu elements and Al_3 RE for alloys containing heavy RE and Y elements. Some factors influencing the extension of solid solubility of Al-RE alloy were discussed.
关键词:
rapid solidification
,
null
,
null
