共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
稀土元素在金中固溶度亚稳扩展研究 总被引:2,自引:0,他引:2
用X射线衍射测定点阵常数法研究了在10^6K/s的快速凝固条件下,稀土元素在Au中的亚稳扩展固浓度,Ce、Sm、Gd、Dy、Er、Yb和Y在Au中的亚稳扩展固溶度分别为0.3、0.4、1.5、9.0、13.13.4和10at%。稀土元素的固溶度随它们与金原子半径相对差的减少而明显增大,用稀土与Au合金化时发生电子从稀土原子向金原子转移来说明稀土在Au中较大的固溶度。比较和讨论了稀土在Au、Ag、A 相似文献
3.
稀土元素在Al中固溶度亚稳扩展研究 总被引:4,自引:0,他引:4
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。 相似文献
4.
用X射线衍射测定点阵常数法,研究了在10^6K/s的快速凝固条件下过渡金属Ti、Zr,Hf,W,Re,Ru,Rh在金中的亚稳扩展固溶度,分别为Ti、18.2,Zr:13,Hf:13.4at%,而W,Re,Ru,Rh则很小。认为上述情况是与金形成相图的特徵有关,形成上包晶型合金有较明显的固溶度扩展,形成偏晶相图的合金难于用快速凝固方法使固溶度扩展,采用机械合金化办法可能更有利于形成亚稳固溶体。 相似文献
5.
6.
合金固溶度理论的进展(一) 总被引:6,自引:0,他引:6
对迄今已有的固溶度理论,作了具体介绍分析。并从所使用的理论方法,所描述的合金固溶度数目、理论预测与实验结果的符合速度,以及有无定量的方程式等方面对诸理论进行了详细比较,讨论了它们的优缺点。最后提出了今后工作的努力方向。文章分两部分发表,第二部分将刊于上海金属1999年第3期。 相似文献
7.
8.
快速凝固Ag—Gd合金的固溶度与时效硬化 总被引:1,自引:1,他引:0
采用锤—砧急冷装置制备了厚0.05~0.07mmAg—Gd系列合金箔试样,冷却速度10~6K/s。采用X射线衍射分析和TEM观察确定合金相结构。亚稳过饱和固溶度达到5.0at%Gd。在快速凝固合金中形成Ag_3Gd六方结构亚稳相。快速凝固Ag—Gd合金具有明显固溶强化和时效强化效应,时效析出相为Ag_(51)Gd_(14)。根据本试验结果建立了快速凝固条件下富Ag端亚稳Ag—Gd相图略图。 相似文献
9.
采用机械合金化方法,对Fe100-xWx(x=5,15,33.3,45,50,70,85,95)二元合金系统进行了机械合金化研究,用X射线衍射仪分析了球磨后的合金粉末的结构,用SEM对样品的形貌进行了分析.结果表明铁在钨中的固溶度大于30%;从理论上对Fe-W系统的固溶度进行计算,计算结果说明铁在钨中的固溶度与实验得到的结果相符. 相似文献
10.
11.
NING Yuantao ZHO U Xinming LI Yongnian Kunming Institute of Precious Metals Kunming China 《金属学报(英文版)》1991,4(8):143-146
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. 相似文献
12.
ZHANG Jingguo ZHANG Xiaomin LIN Yijian Shanghai Iron Steel Research Institute Shanghai ChinaKE Jun 《金属学报(英文版)》1989,2(5):383-386
The microstructure of a laser-melted Fe-4% C-10% Sn alloy has been studied.Anon-crystalline phase was found in the upper part of the laser-melted zone:At the bottom ofthe melted zone,however,the microcrystalline zone which consists of α-Fe and a bet phasewas observed.Fine twinning martensite exists in the other area of the melted zone. 相似文献
13.
14.
15.
PREPARATIONANDCRYSTALLINEMICROSTRUCTUREOFRAPIDLYSOLIDIFIEDNEWAMORPHOUSAl-Fe-V-Si-MmALLOYWangJianqiang;GuTao;ZengMeiguang;Chen... 相似文献
16.
研究了快速凝固Al-Fe-Ti-C合金的显微结构及退火过程中的相变。初始快凝态组织由α-Al微胞晶组成,在胞晶边界分布着较大并拉长的非晶相;在胞晶内部则为细小弥散的球状亚稳Al_6Re相(底心正交结构),Ti和C全部过饱和固溶于α-Al中。当773K退火5h时,非晶相转变为α_T-AlFeSi相(斜方结构),Al_6Fe相部分转变为片状Al_3Fe相(底心单斜结构),部分长大但仍保持球状和底心正方结构过饱和固溶于α-Al基体中的Ti和C则以TiC形式弥散析出。 相似文献
17.
YU Guifu Beijing Institute of Aeronautical Materials Beijing ChinaHE Junfang Institute of Metal Research Academia Sinica Shenyang ChinaLI Qingchun Harbin Institute of Technology Harbin China 《金属学报(英文版)》1992,5(4):256-260
The microstructure and properties of the rapidly solidified Al-Li-Mg-Zr alloy,in relation tothe particle size of supersonic atomizing powder,have been investigated.The finer the size andthe structure of powder,the higher the strength of the alloy.While the overfine powder mayworsen plasticity of the alloy.The proper powder seems to be sized 40—100um. 相似文献
18.
19.
20.
MANG Weishi WANG Guozhi ZHANG Yongchang HU Zhuangqi SHI Changxu Institute of Metal Research Academia Sinica Shenyang China Yongchang Associate Professor Institute of Metal Research Academia Sinica Shenyang China 《金属学报(英文版)》1990,3(4):236-242
A rapidly solidified microcrystalline Al-Li-Cu-Mg-Zr alloy and its superplasicity have beeninvestigated.An optimum tensile elongation of 585% was obtained at 540℃ and strain rate1.67×10~(-2)s~(-1).The superplastic Al-Li alloy is manufaetured using thermomechanical pro-cessing:solution,overaging,warm rolling and recrystallization.Microstructural changes inthermomechanical processing and cavitation occurred during superplastic deformation havebeen observed.The superplastic failure of alloy may be caused mainly by nucleation andgrowth of cavities as well as the linkage around grains. 相似文献