The Experts below are selected from a list of 53595 Experts worldwide ranked by ideXlab platform

Donghui Yang - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of Mg-Al Alloy foam with close-cell structure by powder metAllurgy approach and its mechanicAl properties
    Journal of Manufacturing Processes, 2016
    Co-Authors: Donghui Yang, Zhongyun Hu, Jinghua Jiang, Jianqing Chen, Jun Lu, Weiping Chen, Lei Wang, Hui Wang, Aibin Ma
    Abstract:

    Abstract A powder metAllurgy (PM) approach was developed to fabricate Mg-(15–50)at.% Al foams with closed-cells, where CaCO3 is selected as the blowing agent. The key point of successful foaming is Al addition and the proper sintering treatment, which lead to the formation of intermetAllic compounds and can make the gas release reaction between Mg melt and CaCO3 happen during the foaming process. Besides, the high precursor compact degree, proper foaming temperature (∼620 °C) and foaming time (∼150 s) are required to fabricate Mg-Al Alloy foam with good cellular structure. The compressive stress–strain curves of Mg-Al Alloy foams are serrated during the plateau region due to the intermetAllics in the cell wAlls, and the less Al addition, the less intermetAllics formed in the cell wAlls, the higher yield strength of the Mg-Al Alloy foams.

  • effect of decomposition kinetics of titanium hydride on the Al Alloy melt foaming process
    Journal of Materials Science & Technology, 2015
    Co-Authors: Donghui Yang, Jinghua Jiang, Jianqing Chen, Hui Wang, Z P Lu
    Abstract:

    The gas released from the titanium hydride decomposition is one of the key factors to influence the Al Alloy melt foaming process. In this study, a set of decomposition kinetic equations of titanium hydride was acquired by separating its temperature programmed decomposition (TPD) spectrum, which was acquired by a speciAl designed TPD apparatus with argon used as carrier gas and thermAl conductivity cell as the detector. According to these equations, the decomposition and hydrogen release characteristics of titanium hydride at a fixed/elevated temperature are described quantitatively, which can be applied to forecast the Al Alloy melt foaming process and furnish the theoreticAl basis for fabrication of three-dimensionAl complex shaped Al Alloy foam.

  • the relationship between thermAl decomposition properties of titanium hydride and the Al Alloy melt foaming process
    Materials Letters, 2006
    Co-Authors: Donghui Yang
    Abstract:

    Using a new temperature programmed decomposition (TPD) theory and related experimentAl technique, a set of thermAl decomposition kinetics equations of titanium hydride can be acquired by separating and simulating its TPD spectrum. According to these equations, the relation curve of decomposition quantity and time for titanium hydride at temperature of 940 K is obtained and the result coincides well with the Al Alloy melt foaming process, which provides a scientific basis for controlling the Al Alloy melt foam and then the Al Alloy foams with different pore structure are successfully prepared.

S R Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of decomposition properties of titanium hydride on the foaming process and pore structures of Al Alloy melt foam
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: D H Yang, De Ping He, S R Yang
    Abstract:

    The Al Alloy foam was prepared by melt foaming method with addition of titanium hydride as blowing agent. The effects of thermAl decomposition properties of titanium hydride on Al Alloy melt foaming behavior and pore structures were studied. The decomposition properties of titanium hydride powder were investigated by using temperature programmed decomposition (TPD) set-up. By separating and simulating the TPD spectrum of titanium hydride, a set of thermAl decomposition kinetics equations of titanium hydride were acquired. Combining these equations with researches by using instant freezing method, scanning method and reAl-time method for measuring melt pore structure, the relationship between Al Alloy melt foaming process and decomposition properties of titanium hydride was reveAled, according to which the Al Alloy foam with different pore structures were successfully prepared.

De Ping He - One of the best experts on this subject based on the ideXlab platform.

  • effect of decomposition properties of titanium hydride on the foaming process and pore structures of Al Alloy melt foam
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: D H Yang, De Ping He, S R Yang
    Abstract:

    The Al Alloy foam was prepared by melt foaming method with addition of titanium hydride as blowing agent. The effects of thermAl decomposition properties of titanium hydride on Al Alloy melt foaming behavior and pore structures were studied. The decomposition properties of titanium hydride powder were investigated by using temperature programmed decomposition (TPD) set-up. By separating and simulating the TPD spectrum of titanium hydride, a set of thermAl decomposition kinetics equations of titanium hydride were acquired. Combining these equations with researches by using instant freezing method, scanning method and reAl-time method for measuring melt pore structure, the relationship between Al Alloy melt foaming process and decomposition properties of titanium hydride was reveAled, according to which the Al Alloy foam with different pore structures were successfully prepared.

  • the two steps thermAl decomposition of titanium hydride and two steps foaming of Al Alloy
    Science China-chemistry, 2005
    Co-Authors: Jintang Shang, De Ping He
    Abstract:

    Two steps foaming (TSF) technique was proposed to prepare shaped Al Alloy foam. Based on the thermAl decomposition kinetics equation of titanium hydride, the relationship between two steps thermAl decomposition kinetics of titanium hydride and two steps foaming Al Alloy melt was studied. Two steps thermAl decomposition curve of titanium hydride under increasing and constant temperature was cAlculated respectively. The hydrogen mass needed in the second foaming step was Also cAlculated. Results showed that the hydrogen mass of the second thermAl decomposition of titanium hydride is enough for the second foaming step in the condition of as-received Al melt foaming. ExperimentAl and theoreticAl results indicate that two steps foaming technique can be used to prepare Al Alloy foam with high porosity, shaped components and sandwich with Al Alloy foam core.

  • Static compressive properties of cellular Al and cellular Al Alloy
    Gongneng Cailiao Journal of Functional Materials, 2005
    Co-Authors: Ming Jun Zheng, De Ping He
    Abstract:

    The compressive stress (σ)-strain (ε) curves of cellular Al Alloy (ZL111) and cellular Al have been investigated. The cellular Al Alloy has a higher collapse stress σ\n s than that of cellular Al by 40%. The rake of the plateau of the compressive curve of the cellular Al Alloy was smAller than that of cellular Al. The way that demarcates the densification starting point σ\n D of cellular metAls has been given. It will be helpful in application and research.

D H Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of decomposition properties of titanium hydride on the foaming process and pore structures of Al Alloy melt foam
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: D H Yang, De Ping He, S R Yang
    Abstract:

    The Al Alloy foam was prepared by melt foaming method with addition of titanium hydride as blowing agent. The effects of thermAl decomposition properties of titanium hydride on Al Alloy melt foaming behavior and pore structures were studied. The decomposition properties of titanium hydride powder were investigated by using temperature programmed decomposition (TPD) set-up. By separating and simulating the TPD spectrum of titanium hydride, a set of thermAl decomposition kinetics equations of titanium hydride were acquired. Combining these equations with researches by using instant freezing method, scanning method and reAl-time method for measuring melt pore structure, the relationship between Al Alloy melt foaming process and decomposition properties of titanium hydride was reveAled, according to which the Al Alloy foam with different pore structures were successfully prepared.

He Deping - One of the best experts on this subject based on the ideXlab platform.

  • Comparing of thickening and foaming characters of Al and Al Alloy
    Chinese Journal of Materials Research, 2020
    Co-Authors: He Deping
    Abstract:

    The thickening and foaming histories of Al, Al-Si Alloy, innovated Al Alloy melts were measured. The composition of the three melts thickened by cAlcium and the micro structure of cell wAll were investigsted. The surface tension of the three melts was measured by bubble-pressure method. The results show that the viscosity of melt Al and innovated Al Alloy augments fast since numerous Al-Ca intermediate compounds in smAll particle size are homogenously dispersed. While in Al-Si melt, compounds comprising Ca, Si, Al and other elements forms in relatively large particle size, and thickening in Al-Si melt is less effective compared to Al melt and innovated Al Alloy melt. Under the same ingredient of Ca, the surface tension of Al and innovated Al Alloy melt decrease dramaticAlly, the surface tension of melt Al-Si Alloy only has little drop. The discrepancy of foaming characteristics among the melt Al, Al-Si Alloy and innovated Al Alloy is derived from the difference of surface tension.

  • Ultrasonic attenuation properties of porous and cellular Al Alloy foam with sphericAl pore
    Chinese Journal of Materials Research, 2020
    Co-Authors: He Deping
    Abstract:

    Ultrasonic attenuation properties of two kinds of Al Alloy foam were studied in the range from 1 MHz to 10 MHz. The results show that the ultrasonic attenuation properties are determined by the pore structures of Al Alloy foam. Ultrasonic attenuation coefficient of porous Al Alloy increases with decreasing pore diameter, with decreasing porosity and with increasing specific surface. Ultrasonic attenuation coefficient a of cellular Al Alloy increases with decreasing pore diameter, with increasing porosity and with increasing specific surface Ultrasonic attenuation property of cellular Al Alloy is better than that of porous Al Alloy when they have the similar pore diameter and porosity. They are both light materiAls with good damping properties between 1 MHz and 10 MHz. And the mechanism is that ultrasonic wave is attenuated in the Al Alloy foam with a lot of interface in the elastic stage.

  • thermAl decomposition properties of titanium hydride and Al Alloy foam with low porosity and smAll pore diameter
    The Chinese Journal of Nonferrous Metals, 2004
    Co-Authors: He Deping
    Abstract:

    ThermAl decomposition properties of titanium hydride are acquired by temperature programmed decomposition (TPD) apparatus with metAl tube structure, in which Ar is used as a carrier gas. The relationships between the porosity of Al Alloy melt foam and foaming time at 940 K are gained by displacement sensor-computer system. Pore structures of Al Alloy melt foam with different stirring time of titanium hydride in the Al Alloy melt are studied by image anAlysis method. The compressive properties of the Al Alloy foam are studied. The results show that at 940 K and during the stirring time period of 30～80 s, the porosity of the Al Alloy melt foam is kept constant while the pore number increases and pore diameter decreases, which is a new method to fabricate Al Alloy foam with high specific stiffness, low porosity and smAll pore diameter.

  • AdditionAl force field in cooling process of cellular Al Alloy
    Science China-chemistry, 2002
    Co-Authors: Zheng Mingjun, He Deping, Dai Ge
    Abstract:

    The foaming process of Al Alloy is similar to that of Al, but there is a solid-liquid state zone in the solidification process of cellular Al Alloy which does not exist in the case of Al. In the unidirectionAl solidification of cellular Al Alloy, the proportion of the solid phase graduAlly reduces from the solid front to the liquid front. This will introduce a force and result in a serious quick shrinkage. By the mathematic and physicAl mode, the solidification of the cellular Al Alloy is studied. The data measured by experiment are close to the result cAlculated by the mode. This kind of shrinkage can be solved by suitable cooling method in appropriate growth stage. The compressive strength of the cellular Al Alloy made by this way is 40% higher than that of cellular Al.