Wongsangam, Jittraporn

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Preferred name
Wongsangam, Jittraporn
Alternative Name
Wongsa-Ngam, Jittraporn
Main Affiliation
Email
jittraporn.wo@kmitl.ac.th

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    Item type:Publication,
    The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe Alloy
    (2021-01-01)
    Wongsa-Ngam, Jittraporn
    ;
    Xu, Jie
    ;
    Phongphisutthinan, Chakkrist
    ;
    Langdon, Terence G.
    An aluminum silicon-based alloy (Al-7wt%Si-2wt%Fe) was subjected to severe plastic deformation by the high-pressure torsion (HPT) method. This HPT processing was conducted at room temperature up to five revolutions under a pressure of 6.0 GPa and rotation speed of 1.0 rpm. Observations of microstructure evolution, especially intermetallic phases, was carried out by an optical microscope (OM) and a scanning electron microscope (SEM). It was found that the ironintermetallic particles decreased in size with numbers of turns. This is due to the large strain introduced during HPT processing which produced a degree of fragmentation of intermetallic phases which increased with the imposed strain. In addition, wear behaviors of the as-cast and samples deformed by HPT were also investigated using micro-tribometer UMT-2 (CETR Co., USA) following the ASTM G99-05 (2010) standard. The friction coefficient and wear volume loss were measured to evaluate the effect of imposed strain during HPT processing on wear resistance. It was found that the values of the average friction coefficient were slightly lower in deformed samples and the wear volume loss decreased with increasing numbers of turns.
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    Item type:Publication,
    Microstructure evolution of Al-7wt%Si-2wt%Fe alloy processed by high-pressure torsion
    (2018-08-14)
    Wongsa-Ngam, Jittraporn
    ;
    Phongphisutthinan, Chakkrist
    ;
    Langdon, Terence G.
    The microstructure evolution of an aluminum silicon-based alloy after severe plastic deformation processing was examined. An aluminum silicon-based alloy; Al-7wt%Si-2wt%Fe, was processed by the severe plastic deformation technique called high-pressure torsion at room temperature under a high pressure of 6.0 GPa and rotational speed of 1.0 rpm with numbers of revolution up to 5 turns. Microstructure evolution, especially intermetallic phase, was observed using an optical microscope and a scanning electron microscope (SEM). The effects of high-pressure torsion on the Fe intermetallic compounds in Al-Si alloy were investigated. It was found that the intermetallic particles decreased in size with increasing imposed strains.