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Structure and Properties of Electroless Ni Deposits

Yongzhong ZHANG , Kening SUN and Yiyong WU (School of Materials Science & Engineering , Harbin Institute of Technology , Harbin 150001 , China)Jinwu ZHANG and Mei YAO (Dept. of Materials Science & Engineering , Yanshan University , Qinhuangdao 066004 , China)

材料科学技术（英）

The changes in structure and the hardness of two electroless deposited Ni-P alloy coatings (with P content of 1.5 and 9.5 wt pct) with heat treatment have been studied by XRD and TEM. The deposits containing 1.5 wt pct P can be represented as an fcc NiP supersaturated solid solution of 5~10 nm microcrystallites. whereas the deposits containing 9.5 wt pct P are amorphous. The heat treatment process induces crystallization of amorphous Ni to Ni phosphides and fcc Ni.Both of the deposits reach maximum hardness after annealing at 400℃ for 1 h. All coated steel specimens are inferior in fatigue strength to uncoated steel specimens mainly due to the poor fatigue resistance of the coating itself

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A New Approach to Isothermal Precipitation Kinetics of Carbides

Wantang FU , Zheng WANG , Tianfu JING and Yangzeng ZHENG (Dept. of Materials Engineering , Yanshan University , Qinhuangdao 066004 , China)Jianguo MA(Harbin Frame Factory of Electrical Cable , Harbin , China)

材料科学技术（英）

A new approach to isothermal precipitation kinetics of carbides in undercooled austenite has been proposed firstly, which is based on measuring the changes of Ms point vs holding time at a certain temperature. The isothermal precipitation kinetics (PTT) Curve of carbides was obtained by the use of the method for 13Cr-8Mn-0.07N stainless steel, and compared with the results of chemical phase analysis and TEM method. The results show that the new method is more sensitive and convenient than the other methods.

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IN SITU TEM OBSERVATION OF NANOSILICON FIBRE GROWTH

F.C.Zhang 1) , B.T.Hu 1) , L.X.Zhang 1) and C.F.Lin 2) 1) Department of Materials Science and Engineering , Yanshan University , Qinhuangdao 066004 , China 2) Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China

金属学报(英文版)

Nano silicon particles can be become nano fibre under low energy electron beam bombarding. The formation of the nano silicon fibre include two stages. At first, on the nano silicon particle surface many silicon atoms are gasified, then these silicon atoms deposit in the place where have more charge on account of the static electrical absorption and the point effect of the charge accumulation , these atoms grow into non crystalline silicon fibres. The second stage is the non crystalline silicon fibres crystallizing. Its crystallizing temperature is about 180℃. The growth mechanism of the nano silicon fibre is vapour solid mode.

关键词: nano fibre , null , null

氢对Super-α2合金β固溶后时效组织的影响

王天生 , 廖波 , 苑辉 , 杨柯 , 李依依

材料研究学报

借助透射电镜和X射线衍射仪探讨了氢对Super-α2合金β固溶后时效组织的影响.结果表明,氢使时效组织显著细化,使析出相呈细小板条状规则排布.此外,氢还促进B2相转变为O相.

关键词: Ti3Al基合金 , Institute of Materials Engineering , Yanshan University , Qinhuangdao 066004

NANOCRYSTALLINE STRUCTURE AND INITIAL PERMEABILITY OF ANNEALED Fe_(73.5)Cu_1W_3Si_(13.5)B_9 Alloy

ZHANG Xiangyi , ZHANG Jingwu and ZHENG Yangzeng(Department of Materials Engineering , Yanshan University , Qinhuangdao 066004 , China)Mannscript received 4 September 1995 , in revised form 8 April 1996

金属学报(英文版)

The nanocrystalline structure of annealed Fe73.5 Cu1 W3Si13.5B9 alloy has been investigated by using the XRD and the TEM methods. The relation between the initial permeability and the microstructure of the annealed alloy has been discussed. The crystalline phase in annealed Fe73.5 Cu1 W3Si13.5B9 alloy is the α-Fe(Si) phase with DO3 superstructure. The volume fraction, Si content and degree of order of the αFe(Si) phase increase with increasing annealing temperature. In the temperature range of 490-570℃, the α-Fe(Si) phase has a size of 13 nm, and its grain number increases as the annealing temperature is increased. The DO3 ordered region in the α-Fe(Si) grain is spherical approximately, and its size increases as the annealing temperature increases. The size of the DO3 ordered region is 12.8 nm at the temperature of 570℃,which is close to that of the α-Fe(Si) grain. There is obvious change in the structure of the residual amorphous phase during annealing, and the nearest atomic distance and the short-range order of residual amorphous phase reach maximum and minimum at 530℃, respectively. The initial permeability of annealed Fe73.5 Cu1 W3Si13.5 B9 alloy is not only dependent on the size, volume fraction and Si content of the α-Fe(Si) phase but also related to the structure state of the residual amorphous phase.

关键词: : Fe_(73.5)Cu_1 W_3Si_(13.5)B_9 alloy , null , null , null , null

化学镀NiCOB合金对人造金刚石抗氧化的影响

关长斌 , 周振君 , 于金库

中国腐蚀与防护学报

化学镀ＮｉＣＯＢ合金对人造金刚石抗氧化的影响关长斌，周振君，于金库（燕山大学秦皇岛０６６００４）人造金刚石由石墨十触媒合金在高温超高压下合成，因此是一种亚稳相，耐热性差。在空气中加热到７００℃以上就会明显氧化和石墨化，使强度降低，影响应用。如制作磨具时，使热压烧结温度和焊接温度都受到限制。为了提高人造金刚石的氧化性能，目前国内外都采用镀单一的金属层，如镀Ｎｉ，Ｃｕ或Ｔｉ等［１～３］，但效果均?...

关键词: null , Synthetic diamond , Resistance to oxidation

镀液中的稀土元素对Ni-P合金镀层耐蚀性能的影响

邵光杰 , 王玉林 , 沈德久 , 于金库

中国腐蚀与防护学报

镀液中的稀土元素对Ｎｉ－Ｐ合金镀层耐蚀性能的影响邵光杰，王玉林，沈德久，于金库（燕山大学材料工程系秦皇岛０６６００４）１前言电刷镀Ｎｉ－Ｐ合金镀层作为设备的局部防护处理手段已经得到了广泛应用。但单纯的Ｎｉ－Ｐ合金镀层还不能满足某些部门的要求，进一步提高镀层的耐蚀性能已引起表面处理工作者的注意［１］。本工作研究稀土在电刷镀Ｎｉ－Ｐ合金镀层中的作用。２实验方法基础镀液中的镍离子含量为６０ｇ／Ｌ，?...

关键词: null , Ni-P alloy , Amorphous , Corrosion resistance

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