The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform

Toshiji Mukai - One of the best experts on this subject based on the ideXlab platform.

  • microstructure and mechanical properties of az91 alloy produced with ultrasonic vibration
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Yoshiaki Osawa, Susumu Takamori, Toshiji Mukai
    Abstract:

    Ultrasonic vibration was introduced into the solidification of the AZ91 magnesium alloy. The coarse dendrite microstructure solidified in the AZ91 alloy without any ultrasonic vibration. However, the microstructure with fine uniform non-dendrite grains was achieved with ultrasonic vibration. According to the analysis of refinement mechanism, it indicated that due to the acoustic cavitation and flows induced by ultrasonic vibration, the most of Insoluble Impurity particles become active as nucleation centers and the temperature gradient near the solidification front increases, which led to the fine uniform microstructure. Besides, the AZ91 alloy produced with ultrasonic vibration exhibited the improved mechanical properties at room temperature, such as compressive yield strength (94 MPa), ultimate compressive strength (376 MPa) and fracture strain (22.0%).

Yoshiaki Osawa - One of the best experts on this subject based on the ideXlab platform.

  • microstructure and mechanical properties of az91 alloy produced with ultrasonic vibration
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Yoshiaki Osawa, Susumu Takamori, Toshiji Mukai
    Abstract:

    Ultrasonic vibration was introduced into the solidification of the AZ91 magnesium alloy. The coarse dendrite microstructure solidified in the AZ91 alloy without any ultrasonic vibration. However, the microstructure with fine uniform non-dendrite grains was achieved with ultrasonic vibration. According to the analysis of refinement mechanism, it indicated that due to the acoustic cavitation and flows induced by ultrasonic vibration, the most of Insoluble Impurity particles become active as nucleation centers and the temperature gradient near the solidification front increases, which led to the fine uniform microstructure. Besides, the AZ91 alloy produced with ultrasonic vibration exhibited the improved mechanical properties at room temperature, such as compressive yield strength (94 MPa), ultimate compressive strength (376 MPa) and fracture strain (22.0%).

Christine Frances - One of the best experts on this subject based on the ideXlab platform.

  • Effects of impurities on particle sizing by acoustic attenuation spectroscopy
    Powder Technology, 2010
    Co-Authors: M. Asif Inam, Christine Frances
    Abstract:

    It is important to have correct information regarding particle size in order to interpret, control, and optimize many industrial processes. Prior to the recent advent of acoustic attenuation spectroscopy, it was difficult to study particle size distribution online and under real process conditions in processes involving concentrated dispersions (suspensions or emulsions). The technique still needs improvement because it is less known how and under which conditions to employ the technique when dispersions involve impurities that could be soluble, Insoluble, in the form of additives, and so on. This lack of understanding has almost halted the advancement in applications of the technique to various processes that essentially involve dispersions with impurities. This study investigates aqueous suspensions of CaCO3 at different concentrations (i.e., 5%, 10% and 20% mass/mass) with added impurities of MgCO3 (Insoluble Impurity), NaNO3 (soluble Impurity) and sodium polyacrylate (soluble additive) at varying proportions (5%, 10%, 20% and 30% of the weight of CaCO3). The study characterizes and compares dispersion with and without Impurity in order to demonstrate the possible ways in which addition of an Impurity change the original acoustic attenuation spectrum of a dispersion. The study brings the conditions in which acoustic attenuation spectroscopy is capable of explaining that addition of an Impurity will not change original particle size of the disperse medium.

Susumu Takamori - One of the best experts on this subject based on the ideXlab platform.

  • microstructure and mechanical properties of az91 alloy produced with ultrasonic vibration
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Yoshiaki Osawa, Susumu Takamori, Toshiji Mukai
    Abstract:

    Ultrasonic vibration was introduced into the solidification of the AZ91 magnesium alloy. The coarse dendrite microstructure solidified in the AZ91 alloy without any ultrasonic vibration. However, the microstructure with fine uniform non-dendrite grains was achieved with ultrasonic vibration. According to the analysis of refinement mechanism, it indicated that due to the acoustic cavitation and flows induced by ultrasonic vibration, the most of Insoluble Impurity particles become active as nucleation centers and the temperature gradient near the solidification front increases, which led to the fine uniform microstructure. Besides, the AZ91 alloy produced with ultrasonic vibration exhibited the improved mechanical properties at room temperature, such as compressive yield strength (94 MPa), ultimate compressive strength (376 MPa) and fracture strain (22.0%).

M. Asif Inam - One of the best experts on this subject based on the ideXlab platform.

  • Effects of impurities on particle sizing by acoustic attenuation spectroscopy
    Powder Technology, 2010
    Co-Authors: M. Asif Inam, Christine Frances
    Abstract:

    It is important to have correct information regarding particle size in order to interpret, control, and optimize many industrial processes. Prior to the recent advent of acoustic attenuation spectroscopy, it was difficult to study particle size distribution online and under real process conditions in processes involving concentrated dispersions (suspensions or emulsions). The technique still needs improvement because it is less known how and under which conditions to employ the technique when dispersions involve impurities that could be soluble, Insoluble, in the form of additives, and so on. This lack of understanding has almost halted the advancement in applications of the technique to various processes that essentially involve dispersions with impurities. This study investigates aqueous suspensions of CaCO3 at different concentrations (i.e., 5%, 10% and 20% mass/mass) with added impurities of MgCO3 (Insoluble Impurity), NaNO3 (soluble Impurity) and sodium polyacrylate (soluble additive) at varying proportions (5%, 10%, 20% and 30% of the weight of CaCO3). The study characterizes and compares dispersion with and without Impurity in order to demonstrate the possible ways in which addition of an Impurity change the original acoustic attenuation spectrum of a dispersion. The study brings the conditions in which acoustic attenuation spectroscopy is capable of explaining that addition of an Impurity will not change original particle size of the disperse medium.