B.X. Zhou
,
M.Y. Yao
,
Z.K. Li
,
X.M. Wang
,
J. Zhou
,
C.S. Long
,
Q. Liu
材料科学技术（英文）
In order to optimize the microstructure and composition of N18 zirconium alloy (Zr–1Sn–0.35Nb–0.35Fe–0.1Cr, in mass fraction, %), which was developed in China in 1990s, the effect of microstructure and composition variation on the corrosion resistance of the N18 alloy has been investigated. The autoclave corrosion tests were carried out in super heated steam at 400 °C/10.3 MPa, in deionized water or lithiated water with 0.01 mol/L LiOH at 360 °C/18.6 MPa. The exposure time lasted for 300–550 days according to the test temperature. The results show that the microstructure with a fine and uniform distribution of second phase particles (SPPs), and the decrease of Sn content from 1% (in mass fraction, the same as follows) to 0.8% are of benefit to improving the corrosion resistance; It is detrimental to the corrosion resistance if no Cr addition. The addition of Nb content with upper limit (0.35%) is beneficial to improving the corrosion resistance. The addition of Cu less than 0.1% shows no remarkable influence upon the corrosion resistance for N18 alloy. Comparing the corrosion resistance of the optimized N18 with other commercial zirconium alloys, such as Zircaloy-4, ZIRLO, E635 and E110, the former shows superior corrosion resistance in all autoclave testing conditions mentioned above. Although the data of the corrosion resistance as fuel cladding for high burn-up has not been obtained yet, it is believed that the optimized N18 alloy is promising for the candidate of fuel cladding materials as high burn-up fuel assemblies. Based on the theory that the microstructural evolution of oxide layer during corrosion process will affect the corrosion resistance of zirconium alloys, the improvement of corrosion resistance of the N18 alloy by obtaining the microstructure with nano-size and uniform distribution of SPPs, and by decreasing the content of Sn and maintaining the content of Cr is discussed.
关键词:
Zirconium alloys
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null
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null
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null
NING Yuantao LI Yongnian Kunming Institute of Precious Metals
,
Kunmmg
,
China Professor
,
Kunming Institute of Precious Metals
,
Kunming
,
Yunnan
,
China
金属学报(英文版)
The internal oxidation behavior of Pd-40Ag-1M(M=Zr,Y)alloy wires has been studied in air at 800—1200℃.The relationship between the internal oxidation depth ξ and the reaction time t can be expressed as ξ= Kt~n,where n=0.5—0.75.The higher the temperature,the larger the value of n is.The active elements Zr and Y show different internal oxidation characters.For the alloys eontaining Zr,the oxidation rate along the grain boundaries is about twice as high as that in grains,and“lateral oxidation”exists along the grain boundaries.For the alloys containing Y,the oxidation rates in grains and along the grain boundaries are roughly the same,and there is no“lateral oxidation”along the grain bounda- ries.The activation energies of both alloys are in the range of 120—150kJ/mol.Some prop- erties for oxidized alloys were studied.The mechanisms of the internal oxidation were dis- cussed.
关键词:
Pd-40Ag alloy
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null
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null
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null
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null
王龙章
,
黄克雄
,
骆如铁
,
姚渝
,
叶大陆
,
陈新民
金属学报
本文讨论了双金属共存体系M_1-M_2-x-y,当两种金属的化合物相互作用生成多金属化合物时,优势区相图的绘制原理、方法及计算机程序。通过绘制Zn-Fe-SO系的优势区相图,分析了ZnO·Fe_2O_3的生成及稳定条件,并说明了其在硫化锌矿焙烧中的指导作用。
关键词:
M_1-M_2-x-y体系
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predominance diagram
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roasting
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zinc sulfide ore
Physical Review B
The magnetic properties of 13-atom M clusters (M=Y, Zr, Nb, Mo, and Tc) with three possible high-symmetry geometries have been studied using the discrete-variational local-spin-density-functional method. While the ground states of most transition-metal 13-atom clusters correspond to the icosahedral structure, we found that the cuboctahedral structure is more energetically stable than the icosahedral one for Mo-13 and Tc-13 clusters. The ground states of all the clusters are shown to be magnetic, but their magnetic moments are not striking.
关键词:
rhodium clusters;metal-clusters;molecules;symmetry;states
王塞北
,
邱红莲
,
张吉明
,
胡洁琼
,
王松
,
陈永泰
,
悟有才
,
魏宽
,
谢明
贵金属
采用基于密度泛函理论的第一性原理赝势平面波方法，计算了Au-Pd-M(M=Mo, Y, Zr)合金中可能存在的各种合金相的结合能与生成焓，讨论了合金相的稳定性。结果表明，Au-Pd-M固溶体中，添加质量比为1%的Mo元素形成的固溶体，其结合能与生成焓是Au-Pd-M(M=Mo, Y, Zr)系固溶体中最低的。Au-Pd-Y系合金中最为稳定的中间相是YPd3。Au-Pd-Zr系合金中，形成PdZr2的反应最容易发生，生成的合金相惁是最为稳定的，其次是AuZr3。
关键词:
金属材料
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第一性原理
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Au-Pd-M(M=Mo, Y, Zr)
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固溶体
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中间相
宁远涛
,
李永年
金属学报
在800—1200℃大气气氛中研究了直径0.1-2.0mmPd-40Ag-1Zr和Pd-40Ag-1Y合金丝的内氧化行为及其对性能的影响、内氧化深度ξ与反应时间t的关系可以表示为ξ=Kt~n,其中反应指数n=0.5-0.75。温度越高,n值越大,对内氧化抛物线规律偏离越大,活性元素Zr和Y有不同内氧化特性:含Zr合金晶界氧化速度比晶内氧化约快一倍,且沿晶界存在“侧氧化”;含Y合金晶界与晶内氧化速度相差不大,不存在沿晶界的“侧氧化”。两种合金的内氧化激活能在120—150kJ/mol范围内。讨论了两种合金的内氧化机制。
关键词:
Pd-40Ag合金
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Y
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Zr
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internal oxidation
杨书廷
,
张焰峰
,
吕庆章
,
贾俊华
,
丁立
,
张明春
应用化学
doi:10.3969/j.issn.1000-0518.2000.05.010
以Li2CO3、Mn(NO3)2和M(NO3)3(M=La,Nd,Y)为原材料,用溶胶-凝胶方法和微波加热技术合成了纳米级尖晶石LiMxMn2O4(M=La,Nd,Y)材料,XRD实验表明, 微波合成的材料相纯度较高,充放电实验表明,在LiMn2O4中掺杂摩尔比为0.006的La 、Nd和Y可以提高其电化学比容量和充放电循环性能.
关键词:
LiMn2O4
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掺杂
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稀土
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微波化学
Transactions of Nonferrous Metals Society of China
The influence of Zr and Y on the cast microstructure of a nickel-based superalloy was investigated by optical microscopy (OM), scanning electron microscopy(SEM), electron probe micro-analysis (EPMA) and X-ray diffraction (XRD). The gamma+gamma' eutectic volume in the superalloy rises notably with the increase of Zr or Y content. Meanwhile, the morphologies of primary MC carbides change from needle and platelet-like to blocky shape with increasing Zr and Y doped. The XRD results show that the primary MC carbide lattice constant increases with Zr and Y additions, and EPMA investigation shows that the platelet-like MC carbides contain primarily Nb and C, while those carbides in blocky shape have 39.2% Zr and 39.6% Nb in average,. These influences on the cast microstructure can be attributed to the atomic size effects of Zr and Y.
关键词:
yttrium;zirconium;carbides;nickel based superalloys;microstructure;solidification;carbide morphology;mechanical-properties;boron;ni3al;yttrium;sulfur
王塞北
,
谢明
,
陈永泰
,
杨有才
,
张吉明
,
刘满门
,
胡洁琼
,
王松
,
陈松
贵金属
采用基于密度泛函理论的第一性原理，计算了 Pt-Ir-M(M=Mo, Y, Zr)合金中可能存在的各种合金相，讨论其合金相的稳定性。结果表明，在同等添加量下，Mo 元素的相结构最为稳定。Pt-Ir-Mo系合金中，反应最容易发生的且生成的合金相也最为稳定的是 IrMo3，Pt-Ir-Y 系和 Pt-Ir-Zr 系合金中，则分别是 Ir2Y 和 Ir3Zr 合金相最为稳定。
关键词:
金属材料
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Pt-Ir M(M=Mo, Y, Zr)
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第一性原理
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金属间化合物
