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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：数值模拟软件低压铸造铝车轮收缩缺陷冷却系统频分复用分布分数检测结果

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：数字模拟技术最优化分析铝合金压铸工艺

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： Al合金数值模拟凝固微观组织演变自动机高温度梯度树突细胞钛

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：铝铜合金晶粒细化机械性能微观结构

Zr-Be二元体系金属间化合物结构、电子、力学和热力学性能的第一性原理研究

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稀有金属材料与工程 2022年第5期51卷 1643-1649页

作者：刘瑶翟芳艺米国发刘晨王友超河南理工大学材料科学与工程学院河南焦作454003

基于密度泛函理论和广义梯度近似(GGA)方法,对Zr-Be二元合金中金属间化合物ZrBe_(2)、ZrBe_(5)、ZrBe_(13)和Zr_(2)Be_(17)的结构、电子、力学和热力学性能进行了第一性原理计算。优化后的0 K点阵参数与已有的实验结果基本一致,证明了... 详细信息

基于密度泛函理论和广义梯度近似(GGA)方法,对Zr-Be二元合金中金属间化合物ZrBe_(2)、ZrBe_(5)、ZrBe_(13)和Zr_(2)Be_(17)的结构、电子、力学和热力学性能进行了第一性原理计算。优化后的0 K点阵参数与已有的实验结果基本一致,证明了计算的可靠性。通过计算得到的形成焓和结合能表明,所有的金属间化合物都能在0 K自发形成,其中ZrBe_(5)的合金化能力最强,ZrBe_(2)的结构稳定性最好。随后,电子态密度(DOS)也被用于了解金属间化合物的稳定性。采用应力-应变法计算了这些金属间化合物的独立弹性常数。在此基础上,利用Voigt-Reuss-Hill近似推导出了多晶材料的体模量B、剪切模量G、杨氏模量E、泊松比ν和各向异性A等力学参数。此外,利用Pugh准则、泊松比和柯西压力对金属间化合物的延性行为进行了分析。在热力学性能方面,除了利用准调和近似(QHA)计算晶格振动能量、体模、热膨胀系数和比热随温度变化外,所有的声子色散曲线都说明了这些金属间化合物的动态稳定性。

关键词： Zr-Be二元合金电子结构力学性能热力学性能第一性原理

合金成分对激光熔覆高熵合金涂层影响的研究进展

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特种铸造及有色合金 2022年第7期42卷 847-855页

作者：刘卫东米国发李雷河南理工大学材料科学与工程学院河南焦作454003 上海电机学院材料学院上海201306

高熵合金(High-Entropy Alloys, HEAs)因其兼备优越的力学和电化学性能,得到研究者关注。激光熔覆可在基材表面熔覆具有特种功能的涂层,使单一材质材料成为功能梯度复合材料,通过激光熔覆在材料表面制备HEAs涂层,可显著提升材料表面硬... 详细信息

高熵合金(High-Entropy Alloys, HEAs)因其兼备优越的力学和电化学性能,得到研究者关注。激光熔覆可在基材表面熔覆具有特种功能的涂层,使单一材质材料成为功能梯度复合材料,通过激光熔覆在材料表面制备HEAs涂层,可显著提升材料表面硬度、高温力学性能和耐腐蚀性,延长服役寿命。概述了合金成分及含量对激光熔覆HEAs涂层硬度、耐磨性、耐腐蚀性等性能的影响及其机理,总结了激光熔覆制备HEAs涂层面临的挑战,展望了激光熔覆HEAs涂层的应用前景和发展方向。

关键词：激光熔覆高熵合金力学性能耐腐蚀性能微观组织

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

Multi-wavelength nanowire micro-LEDs for future high speed optical communication

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Opto-Electronic Advances 2024年第3期7卷 1-3页

作者： Ayush Pandey Zetian mi Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMI 48109USA

The future of optoelectronics is directed towards small-area light sources,foremost being ***,their use has been inhibited so far primarily due to fabrication and integration challenges,which impair efficiency and ***,bottom-up nanostructures grown using selective area epitaxy have garnered attention as a solution to the aforementioned *** Fu *** used this technique to demonstrate uniform p-i-n core-shell InGaAs/InP nanowire array light emitting *** devices are capable of voltage and geometry-controlled multi-wavelength and high-speed *** publication accentuates the wide capabilities of bottom-up nanostructures to resolve the difficulties of nanoscale optoelectronics.

关键词： communication high operations