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Al Alloy

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Donghui Yang – 1st expert 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, Weiping Chen, Jun Lu, Jianqing Chen, Hui Wang, Lei Wang, Jinghua Jiang, 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, Jianqing Chen, Hui Wang, Jinghua Jiang, 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 – 2nd expert 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 – 3rd expert 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.