C.L. Chu
,
G.J. Shen
,
S.D. Wang
,
B. Li
,
S.G. Zhang and Z.D. Yin(BOX 433
,
School of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China)(Analysis and Testing Center
,
Southeast University
,
Nanjing 210018
,
China)(Research Institute of Electric Light Source Materials
,
Ministry of Light Industry
,
Nanjing 210015
,
China)
金属学报(英文版)
From the orientation relationship between "Ti11Ni14" phase and matrix phase (B2),the accurate molecular formula of "Ti11N14" phase has been derived in this paper. The results also show that the rhombohedral unit cell of the "Ti11Ni14" phase includes six Ti atoms, seven Ni atoms and one vacancy, belonging to space group R3.
关键词:
TiNi
,
null
,
null
A. G. Liu
,
X.F. Wang
,
L.P. Wang
,
S. Y. Wang
,
B. Y. Tang and P.K. Chu 1) Advanced Welding Production Technology National Key Laboratory
,
HIT
,
Harbin 150001
,
China 2) Department of Physics and Material Science
,
City University of Hong Kong
,
83 Tat Chee Avenue
,
Kowloon
,
Hong Kang
,
China
金属学报(英文版)
Plasma immersion ion implantation (PIII), unrestricted by sight-light process, is considered a proper method for inner surface strengthening. Two-dimensional simulation oj inner surface PIII process of cylindrical bores were carried out in this paper using cold plasma fluid model, and influence of the bore's dimension on impact energy, retained dose and uniformity of inner surface were investigated.
关键词:
plasma immersion ion implantation
,
null
,
null
,
null
G.P. Li
,
D. Li
,
Y. Y. Liu
,
Q.J. Wang
,
S.X. Guan
,
and Q.C. Li (Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China)(School of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China)
金属学报(英文版)
The Ti-35V-15Cr-0.05C (wt% is a new nonburning titanium alloy. The test for alloy combustibility was carried out by using CO2 laser. A 430 watt and 6mm diameter laser spot impinges directly on the sample within normal atmospheric pressure and temperature. The results show that the ignition time of the nonburning titanium alloy is the longest in the eight examined titanium alloys, and is 3.5 times that of TC4 alloy. The ignition tempeerature of the nonburning alloy is 2991° C, and is higher than that of TC4 alloy by 1976°C. On the condition of high tempeerature and rich oxygen,the surface of alloy forms a melting layer which plays roles of oxygen insulation, heat insulation and burning products insulation. This is the mechanism of combustion resistance.
关键词:
Ti-35V-15Cr-0.05C (wt%) nonburning titanium alloy
,
null
C. Q. Wang
,
X. J. Zha
,
C. Q. Zhang
,
S. Q. Yang
,
C. Z. Wang( 1)National Lab of Advanced Welding Technology
,
HIT
,
Harbin 150001
,
China 2)Shanghai Institute of Metallurgy
,
Chinese Academy of Science
,
Shanghai 200050
,
China)
金属学报(英文版)
Solder joint reliability is one of critical problems detemining whether Sirface Mount Technology (SMT) can be used in the prohotion of important electronic products. Optimizing solder joint shape is one of effective ways to improve SMT solder joint reliability.In this paper. based on the theorem of minimum potential energy, an energy model of 3 - D solder joint shape is established,and the forma- tion of solder joint is numerically simulated by Surface Ecolver program. On the basis of the prediction of SMT solder joint shape,the mechanical model of analyzing solder joint reliability is established. An elasto - plasto - creep mateial model and its mechanical constitutive equaton are established for SnPb solder alloy, and the stress/strain response of SMT solder joint under thermal cyclical loabing is ana- lyzed with nonlinear 3 - D FEM. The fatigue life of solder joint is predicted according to Coffin- Manson fatigue life model. An integrated system for Predicting and analyzing SMT solder joint shape and reliability(PSAR) is developed.The system can analyze efficiently SMT solder joint reliability with the variation of structural parameters in the joint and give the optimal structure.
关键词:
SMT
,
null
,
null
,
null
X.B. Tian
,
X.F. Wang
,
A.G. Liu
,
L.P. Wang
,
S. Y. Wang
,
B. Y. Tang and P. K. Chu 1)Advanced Welding Production & Technology National Key Laboratory
,
Harbin Institute of Technology
,
Harbin 150001
,
China 2)Department of Physics & Materials Science
,
City University of Hong Kong
,
China
金属学报(英文版)
The research on plasma immersion ion implantation has been conducted for a little over ten years. Much is needed to investigate including processing technlogy, plasma sheath dynamics, interaction of plasma and surface, etc. Of the processing methods elavated temperature technique is usually used in PIII to produce a thick modified layer by means of the thermal diffusion. Meanwhile plasma ion heating is more recently developed by Ronghua Wei et al[1]. Therefore the temeperature is a critical parameter in plasma ion processing. In this paper we present the theoretical model and analysize the effect of imlantation voltage, plasma density, ion mass,etc on the temperature rise.
关键词:
plasma immersion ion implantation
,
null
,
null
L. H. Lang
,
D. C. Kang
,
S. H. Zhang
,
Z. R. Wang
,
S. J. Yuan
,
K. B. Nielsen and J. Dancket 1) Department of Materials Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China 2) Aalberg University
,
Denmark
金属学报(英文版)
In this paper, the forming features of tapered rectangular box during hydrodynamic deep drawing are studied by means of FEM.The effect rules of square blank corner corner amount on body wrinkling are recognized and corresponding methods are discussed. At last, the results of FEM are verified by experi- ment.
关键词:
sheet metal forming
,
null
,
null
J.X. Zhang
,
YF. Zheng
,
W .Cai and L. C. Zhao (School of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China )
金属学报(英文版)
The A/D type twin boundary in a Cu-Zn-Al shape memory alloy appears curved under TEM and shows impularly sermted steps under HREM Crystallogmphic analysis shows that the macroscopic curve results hem non-selfaccommodation of the boundary, the deviation from exact twin orientation and a pwtrential orientation for lower boundary enerpy.
关键词:
shape memory alloy
,
null
,
null
Hongbo LIU
,
Kuiying CHEN
,
Zhuangqi HU (State Key Lab. of RSA
,
Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)Geying AN(School of Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China)
材料科学技术（英文）
A simple analytic embedded-atom model of monoatoms that includes more than nearest neighbours has been extended to study properties of binary liquid Cu-Ni alloys, here the two-body potential between different species of atoms is taken as a function of the two-body potential for the pure metals with a unique form which yields alloy models with the same invariance to electron density transformations as monoatomic models. Faber-Ziman structure factors have been computed by molecular dynamics simulation on the base of this model. The results are in good agreement with experimental data given by Waseda, thus supporting the overall validity of the approach, especially for cross potential of Cu-Ni pair. Further, a detailed description of structure of binary liquid Cu-Ni alloys with different compositions have been performed using pair analysis and bond orientational order method etc., and then the chemical short range order has also been examined to reveal the structural characterization.
关键词:
S. J. Chen
,
S. Y. Yin
,
L. Feng and L. Y. Li( 1) School of Materials Science and Engineering
,
Beijing Polytechnic University
,
Beijing 100022
,
China 2)National Key Laboratory of Advanced Welding Production Technology
,
HIT
,
Harbin 150001
,
China)
金属学报(英文版)
Based on the existing component models in the Pspice software package, a combined model for Insulat- ed the Bipolar Transistor (IGBT) is established, in which a non - linear is introduced to represent the parasitic capacitance. Using this model, computerized simulation is conducted for the FB - ZVZCS - PWM soft - ewitching converter,the switching and energy-transferring characteristics of the components are analyzed.The simulation results are testified by experiments.It is proved that by abopting appropriate models,computerized simulation becomes an effective tool for investigation of arc welding inverter power source.
关键词:
arc welding inverter
,
null
,
null
