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LOCALIZED CORROSION OF MICROCRYSTALS OF 1Crl8Ni9Ti STAINLESS STEEL

LIU Dacheng CAO Chunan WANG Fuhui LOU Hanyi ZHA NG Lixin Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , China[Originally published in ACTA METALL SIN (CHINESE EDN) 24 (5) 1988 pp B369—B371 , received 28 September 1987 , in revised form 16 December 1987]

金属学报(英文版)

The resistances against localized corrosion of 1Cr18Ni9Ti microcrystals with normal grain size and bcc structure obtained hy magnetron sputtering have been compared.The two kinds of microcrystals with (110) and (211) textures respectively were obtained under different sputtering conditions.Both microcrystals were found to have better resistance against local- ized corrosion than the crystal with normal grain.The microcrystal with (110) preferred orientation has larger resistance to localized corrosion than that with (211) preferred orientation.

关键词: microcrystal , null , null

Fe-28Al合金中相转变

杜国维 , 王政 , 肖纪美

金属学报

应用电镜及Ｘ射线衍射技术研究了含Ｃｒ及不含Ｃｒ的Ｆｅ－２８ａｔ．－％Ａｌ合金中相变结果表明，１０８０℃淬火过程中，Ｂ２结构热畴已开始形成；缓冷通过Ｂ２相区，沿晶界出现α相；对Ｆｅ－２８Ａｌ－５Ｃｒ合金还出现细小的ＣｒＮ相沉淀，板状合金中Ｂ２→Ｄ０３是一缓慢转变过程．

关键词: Ｆｅ_３Ａｌ , B2 antiphase domain , D0_3antiphase domain , α-phase , CrN precipitate

Crystal structure and magnetic properties of Gd3Fe28Re

Journal of Physics-Condensed Matter

The structure and magnetic properties of a ternary intermetallic compound Gd3Fe28Re stabilized by Re in the sixth period has been investigated by means of XRD analysis and magnetic measurement. The compound crystallizes in the monoclinic Nd-3(Fe,Ti)(29)-type structure with space group A2/m. The lattice parameters are a = 10.5778(1) Angstrom, b = 8.5317(1) Angstrom, c = 9.6945(2) Angstrom, and beta = 96.85(1)degrees. The preferential occupancy of Re over the 4g, 4i(3) and 4i(4) crystallographic sites were determined successfully by Rietveld refinement of XRD data, which is basically attributed to the effect of size. The compound exhibits planar magnetocrystalline anisotropy perpendicular to the [204] direction. The Curie temperature T-C, the saturation moment M-S and the magnetocrystalline anisotropy field H-A are derived to be 467 K, 35.1 mug f.u.(-1) and 69.4 kOe, respectively.

关键词: intermetallic compounds;neutron-diffraction;carbides;alloys;sm

27,28P+28Si总反应截面增强及可能相关的机制

刘祖华 , 阮明 , 赵跃林 , 张焕乔 , 杨峰 , 马中玉 , 林承键 , 陈宝秋 , 吴岳伟 , 詹文龙 , 郭忠言 , 肖国青 , 徐瑚珊 , 孙志宇 , 李加兴 , 陈志强

原子核物理评论 doi:10.3969/j.issn.1007-4627.2004.04.002

测量了27, 28P和相应同中子异位素在28Si靶上的中能反应截面. 测得N=12和13同中子异位素的反应截面在Z=15处突然增大. 对Z≤14同中子异位素和28P的实验数据结果可以用改进的光学极限近似的Glauber理论很好地描述. 28P的反应截面能够用扩大核芯以改进的Glauber理论来解释. 但是, 用改进光学极限和少体近似的Glauber理论却低估了27P的实验数据. 理论分析表明, 扩大的核芯加质子晕可能是响应27P+28Si反应截面增强的机制.

关键词: 反应截面 , Glauber理论 , 质子晕 , 扩大的核芯

Cathode spot propagation on the surface of amorphous, nanocrystalline and crystalline Cu60Zr28Ti12 cathodes

Physics Letters A

Arc tracks on the surface of coarse crystalline, amorphous, and nanocrystalline Cu60Zr28Ti12 cathodes were investigated. On the surface of coarse crystalline Cu60Zr28Ti12, cathode spots were restricted to a small zone, while on the surface of amorphous and nanocrystalline Cu60Zr28Ti12 cathodes, the spots spread over a wide area, of about 15 x 2.4 mm(2) and more. The arc tracks on the amorphous ribbons had a worm-like form, which is attributed to continuous cathode spot motion. The arc track on nanocrystalline Cu60Zr28Ti12 alloys, crystallized from the amorphous alloy, consisted of densely distributed similar to 3 mum craters. (C) 2003 Elsevier B.V. All rights reserved.

关键词: Cu60Zr28Ti12 amorphous alloy;nanocrystalline;cathode spots;arc track;vacuum;plasma;arcs/;ti

Ca8.1Gd0.9Co12O28的制备及热电性能研究

刘洪权 , 王福平

稀有金属材料与工程

采用固相法合成Ca9Co12O28和Ca8.1Gd0.9Co12O28前驱粉体,利用290MPa冷等静压成型,然后无压烧结成瓷.并对它们的热电性能进行了研究.实验结果表明:Ca81Gd0.9Co12O28热电性能优于Ca9Co12O28,两者都属于P型半导体热电材料;由于两者的致密度不高,造成电导率偏低,导致最终热电评价指标ZT值较低.

关键词: Ca81Gd0.9Co12O28 , 热电性能 , 冷等静压

Fe-28Al-5Cr与Fe-28Al-5Cr-0.5Nb-0.1C合金的超塑性变形能力及特征

高德春 , 杨王玥 , 黄晓旭 , 孙祖庆

金属学报

研究了Fe-28Al-5Cr(原子分数)与Fe-28Al 5Cr-0.5Nb 0.1C合金的高温变形行为,结果表明,在850℃左右,应变速率为8.3×10-4s-1时,呈现-定的超塑性变形能力,延伸率分别达到145%和254%;应变速率敏感指数m分别为0.4与0.35;激活能分别为:243 kJ/mol与218 kJ/mo1.在变形过程中,位错堆积形成小角度晶界,并逐渐转变成大角度晶界,使粗大的原始晶粒细化

关键词: Fe3Al基合金 , null , null

Fe-28Al-5Cr与Fe-28Al-5Cr-0.5Nb-0.1C合金的超塑性变形能力及特征

高德春 , 杨王玥 , 黄晓旭 , 孙祖庆

金属学报 doi:10.3321/j.issn:0412-1961.2001.03.015

研究了Fe-28Al-5Cr(原子分数)与Fe-28Al 5Cr-0.5Nb 0.1C合金的高温变形行为,结果表明,在850℃左右,应变速率为8.3×10-4s-1时,呈现-定的超塑性变形能力,延伸率分别达到145%和254%;应变速率敏感指数m分别为0.4与0.35;激活能分别为:243 kJ/mol与218 kJ/mo1.在变形过程中,位错堆积形成小角度晶界,并逐渐转变成大角度晶界,使粗大的原始晶粒细化

关键词: Fe3Al基合金 , 超塑性 , 激活能