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Grain refinement and mechanism of CAl_(0.5)W_(0.5) compound in Mg-Al alloys

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Rare Metals 2010年第6期29卷 630-634页

作者： LIU Baozhong FAN Yanping PENG Qiuming mi guofa WANG Limin School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChangchun 130022China

The effect of CAl0.5W0.5（CAW） compound on the grain refinement of Mg-Al based alloys was *** results show that CAW compound is an effective and active grain *** grain size of binary Mg-Al alloys is more than 500 μm,and it is changed to about 110 μm with a 1 wt.% CAW *** hardness increased with the decease of grain size *** mechanical properties are improved by the *** fine grain size is mainly ascribed to the dispersed Al2CO particles,which are very potent nucleating substrates for Mg-Al *** nucleation cores formed by chemical reaction directly are well-distributed in the matrix.

关键词： magnesium alloys grain refinement refiner mechanism mechanical properties

Numerical simulation of low pressure die-casting aluminum wheel

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China Foundry 2009年第1期6卷 48-52页

作者： mi guofa Liu Xiangyu Wang Kuangfei Fu Hengzhi School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454003 P. R. China Department of Mechanical Engineering Chengde Petroleum College Chengde 067000 P. R. China

The FDM numerical simulation software,ViewCast system,was employed to simulate the low pressure die casting(LPDC)of an aluminum *** analyzing the mold-filling and solidification stage of the LPDC process,the distribution of liquid fraction,temperature field and solidification pattern of castings were *** potential shrinkage defects were predicted to be formed at the rim/spoke junctions,which is in consistence with the X-ray detection *** distribution pattern of the defects has also been studied.A solution towards reducing such defects has been *** cooling capacity of the mold was improved by installing water pipes both in the side mold and the top *** on the shrinkage defects under forced cooling mode proved that adding the cooling system in the mold is an effective method for reduction of shrinkage defects.

关键词： numerical simulation aluminum wheel low pressure die castina defect reduction forced coolina

Numerical simulation and optimization of Al alloy cylinder body by low pressure die casting

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China Foundry 2008年第2期5卷 99-103页

作者： mi guofa Liu Yanlei Zhao Hengtao Fu Hengzhi School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454000 China

Shrinkage defects can be formed easily at critical location during low pressure die casting (LPDC) of aluminum alloy cylinder body. It has harmful effect on the products. Mold filling and solidification process of a cylinder body was simulated by using of Z-CAST software. The casting method was improved based on the simulation results. In order to create effective feeding passage, the structure of casting was modified by changing the location of strengthening ribs at the bottom, without causing any adverse effect on the part's performance. Inserting copper billet at suitable location of the die is a valid way to create suitable solidification sequence that is beneficial to the feeding. Using these methods, the shrinkage defect was completely eliminated at the critical location.

关键词： aluminum alloy cylinder body numerical simulation optimization

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激光熔覆陶瓷涂层的研究进展

特种铸造及有色合金 2024年第7期44卷 886-896页

作者：张利超米国发李雷霍晓阳刘卫东王修虎河南理工大学材料科学与工程学院焦作454000 上海电机学院材料学院上海201306

简要概括了激光熔覆技术原理,并系统介绍了激光熔覆纯陶瓷涂层、金属陶瓷复合涂层、生物陶瓷涂层、纳米陶瓷涂层、前驱体转化陶瓷涂层的研究现状及存在问题。总结了激光熔覆工艺参数与辅助处理对陶瓷涂层内部组织成分及宏观形貌、性能... 详细信息

简要概括了激光熔覆技术原理,并系统介绍了激光熔覆纯陶瓷涂层、金属陶瓷复合涂层、生物陶瓷涂层、纳米陶瓷涂层、前驱体转化陶瓷涂层的研究现状及存在问题。总结了激光熔覆工艺参数与辅助处理对陶瓷涂层内部组织成分及宏观形貌、性能的影响,并对激光熔覆金属基陶瓷涂层提出改进措施与展望。

关键词：激光熔覆陶瓷涂层工艺参数:表面改性

维普期刊数据库博看期刊

Simulation of microstructural evolution in directional solidification of Ti-45at.%Al alloy using cellular automaton method

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China Foundry 2010年第1期7卷 47-51页

作者： Wang Kuangfei Lu Shan mi guofa Li Changyun FU Hengzhi School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454100 China School of Electromechanical Engineering Jiaozuo University Jiaozuo 454100 China

The microstructural evolution of Ti-45 at.%Al alloy during directional solidification was simulated by applying a solute diffusion controlled solidification *** obtained results have shown that under high thermal gradients the stable primary spacing can be adjusted via branching or competitive *** dendritic structures formed under a high thermal gradient,the secondary dendrite arms are developed not very well in many cases due to the branching mechanism under a constrained dendritic growth ***,it has been observed that,with increasing pulling velocity,there exists a cell/dendrite transition region consisting of cells and dendrites,which varies with the thermal gradient in a contradicting way,*** of the thermal gradient leading to the decrease of the range of the transition *** simulations agree reasonably well with experiment results.

关键词： Ti-Al based alloy directional solidification solute diffusion controlled mode cellular automaton

microstructure and Tensile Properties of Spray-deposited IC6 Alloy

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Journal of Materials Science & Technology 1998年第2期14卷 143-146页

作者： mi, guofa Li, Zhou Tian, Shifan Zhao, Xianguo Luo, Zhiping Zeng, Songyan Li, Qingchun Inst Aeronaut Mat Beijing 100095 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The microstructure and mechanical properties of a Ni//3 Al based Ni-Al-Mo superalloy-IC6 which possesses low impurity content and high density by spray deposition technique have been studied. The results indicate that the IC6 alloy has good tensile strength and elongation both at room and intermediate temperatures. (Edited author abstract) 6 Refs.

关键词： Nickel alloys

microstructure and properties of ZL205 Alloy

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China Foundry 2008年第1期5卷 24-27页

作者： mi guofa Wang Kuangfei Gong Haijun Wang Hongwei Zeng Songyan School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454000 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The microstructure, precipitate type, precipitate distribution and tensile strength of a ZL205 alloy, beforeand after ageing treatment, have been studied by means of optical microscopy and transmission electron *** results showed that the as-cast microstructure of the alloy was made up of α-Al and eutectic phase distributedat the grain boundaries. During ageing treatment, the tensile strength increased at first and then reduced with time,and the highest ultimate tensile strength was found to be around 488.2 MPa.

关键词： Al-Cu alloy grain refinement mechanical property microstructure

miCROSTRUCTURE AND MECHANICAL PROPERTIES OF PARTICULATE REINFORCED MATRIX COMPOSITE

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Chinese Journal of Aeronautics 1997年第2期10卷 127-130页

作者： mi guofa Li Zhou Tian Shifan(Institute of Aeronautical Materials, Beijing, 100095, China)Zeng Songyan Li Qingchun(Harbin Institute of Technology, Harbin, 150001,China) Institute of Aeronautical Materials Beijing 100095 China Harbin Institute of Technology Harbin 150001 China

TiB2 - particulate- reinforced Ni3 Al composites were prepared by spray a tom-ization co-deposition technique. The reinforcement particulate can be uniformly distributedin matrix alloy, and no interaction would be fou... 详细信息

关键词： particulate reinforced composites microstructure mechanical properties spray atomization co-deposition

microstructure of a Spray Deposited Intermetallic Compound Alloy of Ni-Al-Mo System

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Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 375-378页

作者：米国发 Institute of Material Physics & Metallurgy Henan Polytechnic University

The microstructure of a spray deposited intermetallic compound alloy of Ni-Al-Mo system（Ni3Al-Mo intermetallic compound alloy） prepared by a spray atomization deposition was studied in detail by using optical metallography,XRD,DTA,SEM,TEM,HREM and computer *** preform consists of uniform and equiaxial grains,ranging from 10-40 μm,with some *** the main phases of the matrix alloy γ＇ and γ,Ni2Mo and Ni3Mo phases are also found within the γ network.A new Ni enriched phase in the γ phase was identified to have face-centered cubic structure with a lattice constant α=1.09 nm and space group Fm3m.

关键词： spray atomization co-deposition Ni3Al-Mo superalloy microstructure