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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（英文）

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（英文）

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

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

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