Acta Metallurgica Sinica
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ISSN 0412-1961
CN 21-1139/TG
Started in 1956
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Current Issue
, Volume 31 Issue 13
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STUDY ON FORMATION OF LUTETIUM ALLOYS IN CHLORIDE MELT
LIU Guankun; YANG Qiqin; TONG Yexiang; LIU Qingfeng (Zhongshan University; Guangzhou 510275)(Manuscript received 94-05 -03)
Acta Metall Sin, 1995,
31
(13): 1-9.
Abstract
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(521KB) (
569
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The formation of lutetium alloys on the Cu. Co. Ni and Fe cathodes in NaCl-KCl-LuCl_3 melt has been investigated. The cyclic voltammograms of Lu(Ⅲ) on Cu.Co, coefficient of Lu(Ⅲ) are measured. Potentail-time curves have been made to testify the number of alloys and to calculate the free energy of formation of the lutetium alloy on the Cu.Co, Ni and Fe electrodes in NaCl-KCl-LuCl_3 melt at 800℃ . The relationship between diffusion coefficient and temperature of Lu atom in Lu_2Co_(17) alloy phase which is determined by means of current-time curves can be expressed as In D=-55.7 × 10~3/RT-16.3, the diffusion activation energy is 55.7 kJ/mol. Correspondent: LIU Guankun, professor, Department of Chemistry, Zhongshan University,Guangzhou 510275
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EMBEDDED-ATOM-METHOD FUNCTION FOR hcp METALS Mg, Ti AND Zr
JIANG Bingyao; LIU Xianghuai; ZOU Shichang(Ion Beam Laboratory; Shanghai Institute of Metallurgy ; Chinese Academy of Sciences; Shanghai 200050); SUN Jian(Shanghai Jiaotong University; ShanKhai 200030)(Manuscript received 94-01-18. in revised form 94-06-20)
Acta Metall Sin, 1995,
31
(13): 10-14.
Abstract
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(277KB) (
909
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The embedded function for use with the embedded-atom-method was determined empirically by fitting to the equilibrium lattice constant, the sublimation energy, elastic constants, vacancy- formation energy of the pure metal and the bond energy of the diatomic molecule. The stability of the hcp lattice structure was checked by computing the energy of the bcc and fcc phases for all three metals, and in all three cases. the hcp structure was found to be energetically favoured over the bcc and fcc structures. Correspondent JIANG Bingyao, Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050
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SPIN COMBUSTION IN (3Ni+Si) SYSTEM
YAN Xinyan(Southeast University; Nanjing 210018) ZHANG Shuge(Research Institute of Electric Light Source Materials; Nanjing; 210015); SUN Guoxiong(Southeast University); Nanjing 210018)(Manuscript received 94-04-04)
Acta Metall Sin, 1995,
31
(13): 15-20.
Abstract
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(490KB) (
452
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The effects of reactant particle size. Si content, preheating temperature and bulk density of the green compacts on the characteristics of spin combustion (such as frequency of spin, pitch, average combustion wave velocity and combustion temperature) in (3Ni+Si) systems have been studied in detail. The phenomena of spin combustion has been analyzed and discussed. Correspondent; YAN Xinyan, Department of Mechanical Engineering, Southeast University, Nanjing 210018
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LASER SYNTHESIS AND CHARACTERIZATION OF NANO-CRYSTALLINE Si POWDER
LI Yali; LIANG Yong; XIAO Keshen; ZHENG Feng; HU Zhuangqi(State Key Lab of RSA ; Institute of Metal Research; Chinese A cademy of Sciences; Shenyang 110015)(Manuscript received 94-02-28)
Acta Metall Sin, 1995,
31
(13): 21-25.
Abstract
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(352KB) (
560
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Nano-crystalline Si powder with mean particle diameter of 20 -100 nm and grain diameter of 18-37 nm has been synthesized by laser-induced high purity silane gas reaction. The influences of processing parameters on the formation of the powders was studied and the powders produced were characterized by various techniques (TEM. XPS. XRD.FTIR and BET). Results show that the powder consists of monodispersed spherical particles and agglomerated irregular particles. The Si powder with monodispersed equiaxed particles with small size are favoured to form under lowering laser power and raising Ar dilute. There is 2.0- 3.0 wt-% of oxygen impurities in the Si powder mainly existing on particle surface in O-Si-H bond state. which came from the chemisorption of the powder to oxygen in air. Correspondent. LI Yali, Institute of Metal Research. Chinese Academy of Sciences Sheayang 110015)
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FATIGUE PROPERTIES FOR 20G AND 2.25Cr-1Mo STEELS AFTER HYDROGEN ATTACK
LI Jianli; LI Xiaogang;XIE Genshuan; YAO Zhiming ; LI Jin; KE Wei(Corroston Science Laboratory; Instate of Corrosion and Protection of Metals; Chinese A cedemy of Sciences; Shenyang; 110015)(Manuscript received 94-07-22)
Acta Metall Sin, 1995,
31
(13): 26-30.
Abstract
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(358KB) (
636
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The mechanical properties and fatigue crack growth behaviour for 20G and 2.25Cr-1Mo steels after hydrogen attack have been investigated. The microstructure after hydrogen attack and the propagation path of fatigue crack have been observed by optical microscopy. The results showed that hydrogen attack resulted in an obvious increase in fatigue crack growth rate for 20G steel;however, the threshold △K value decreased at the beginning of hydrogen attack, and increased at the successive stage for the same material.The 2.25Cr-1Mo steel showed a lower susceptibility to hydrogen attack due to the action of element Cr and Mo, not resulting in a significant change in fatigue crack behaviour.It is suggested that the increase in the threshold △K value could be attributed to the crack closure effect caused by the tortuous cracking path. Correspondent; LI Jianli, Instrtute of Corration and Protection of Metall, Chinese Academy of Sciences ,Shenyang 110015)
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STRUCTURE AND PROPERTIES OF TiN FILMS PREPARED BY FACING TARGETS SPUTTERING
LIU Yuguang; JIANG Enyong; CHENG Qi; SUN Changqing (Department of physics.Tianjin University. Tianjin 300072)(Manuscript received; 94-04-07)
Acta Metall Sin, 1995,
31
(13): 31-34.
Abstract
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531
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The hardness (HV) of one of single-phase and (111) preferred orientation TiN films that were prepared by facing targets sputtering (FTS), is as high as 3800, the preferred orientation can change from ( 111 ) to (200) with the increase of substrate bias voltage, the lattice parameters vary with the pressure ratio of N_2 to Ar, the lattice expansion can be explained by the mechanism of interstitial N atom into the tetrahedral hole. Correspondent: LIU Yuguang. Lecturer, Department of physics, Tianjin University. Tianjin 300072
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SUPERPLASTICITY IN Fe_3Al ALLOY WITH LARGE GRAINS
SHAN Aidang;LIN Dongliang; CHEN Mingwei; LI Dingqiang(Shanghai Jiaotong Universitty; Shanghai 200030)(Manuscript received. 94-05-12)
Acta Metall Sin, 1995,
31
(13): 35-39.
Abstract
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(351KB) (
628
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High temperature deformation behaviour of Fe-28Al-2Ti alloy with large grains was examined. This alloy showed superplasticity in the temperature range of 750℃ to 900℃ under a strain rate of 1 × 10~(-3)/ s and maintained superplastic it at 850℃ in a relatively wide range of strain rate. The highest m value may exceed 500%. At 850℃ . m value changes from 0.22 to 0.41 under different strain rates. Optical and TEM observations revealed that a dynamic recrystallization process took place with the deformation process and this in turn resulted in the superplasticity in this alloy with large grains Correspondent: LIN Dongliang,professor , Department of Materials Science, Shanghai Jiaotong University,Shanghai 200030
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CONCEPT AND FABRICATION OF METAL MATRIX INTRAGRANULAR COMPOSITES
WANG Zidong; HU Hanqi (University of Science and Technology Beijing; Beijing 100083); LI Chunyu; LIU Baicao (Beijing Institute of Aeronautical Materials ; 100095)(Manuscript received 94-07-25)
Acta Metall Sin, 1995,
31
(13): 40-43.
Abstract
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(343KB) (
607
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It is successful to prepare the AI / TiC intragranular composites fabricated by XD+ casting and contact reaction method. The concept, formation conditions and formation mechanism of metal matrix intragranular composites were presented. The intragranular composite between α-Al and TiC leads to crystalline fracture. Correspondent. WANG Zidong, postdoctoral, Univerity of Science and Technollogy Beijing, Beijing 100081
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SIMULATION OF INDENTATION MICROHARDNESS TESTING
CAI Xun; ZHOU Pingnan; (Shanghai Jiaotong University ; Shanghai 200030)Bangert H (Technical University of Vienna; Auslria)(Manuscript received 94-07-18)
Acta Metall Sin, 1995,
31
(13): 44-5.
Abstract
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(455KB) (
542
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In order to explain many of the phenomena observed in microindentation test.for example, the substrate effect on the microhardness measurements of coating-substrate systems, the determining of the critical load and the apparent microhardness increase with decreasing load etc, the finite element method is applied to simulate the microindentation process on bulk materials and coating-substrate systems. Correspondent. CAI Xun. professor. Department of Materials Science, Shanghai Jiaotong University,Shanghai, 200030
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