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TÜNÇAY, MEHMET MASUM

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TÜNÇAY

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MEHMET MASUM

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2016 - 20172
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    PublicationOpen Access
    Evaluation of the Particle Bonding for Aluminum Sample Produced by Spark Plasma Sintering
    (SPRINGER, 2016-10) TÜNÇAY, MEHMET MASUM; Tuncay, Mehmet Masum; Nguyen, Lucie; Hendrickx, Philippe; Brochu, Mathieu
    Spark plasma sintering (SPS) is a powder metallurgy process that sinters powder materials within a short time by simultaneous application of electrical current and pressure. SPS differs from other conventional powder metallurgy processes by its heating mechanism, which is Joule heating of the sample within a graphite die. This study investigates the consolidation of aluminum powder by SPS. Different pressures were used and particle bonding evaluated by means of fracture surface analysis. Electrical resistance, obtained from online monitoring of the variation of voltage and current during the process, showed an enhanced descent at 0.3 T (m), and the area under this drop was associated with ductility: the greater the area, the higher the ductility. This temperature corresponds to a significant increase in the hardness ratio of the oxide layer to aluminum, where breakdown of the oxide layer becomes easier, permitting enhanced metallurgical bonding between the powder particles.
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    PublicationOpen Access
    Spark plasma sintering and spark plasma upsetting of an Al-Zn-Mg-Cu alloy
    (ELSEVIER SCIENCE SA, 2017-09) TÜNÇAY, MEHMET MASUM; Tuncay, Mehmet Masum; Muniz-Lerma, Jose Alberto; Bishop, Donald Paul; Brochu, Mathieu
    Al-Zn-Mg-Cu alloy powder Alumix 431D was sintered at 400 degrees C by spark plasma sintering (SPS) and upset forging was applied to the sintered sample through SPS. Densities of 99.1 +/- 0.3% and 99.8 +/- 0.1% of theoretical were obtained for the sintered and forged samples, respectively. T6 temper was carried out on the samples and microstructure analysis and mechanical properties before and after heat treatment were evaluated. Microhardness of 173 +/- 3 and 172 +/- 3 HV were attained in the T6 temper of as-sintered and forged samples, respectively. The flexural strength and strain values were significantly improved after the forging process, which can be mainly attributed to the better particle bonding in addition to the occurrence of some recrystallization. Significant loss in the ductility was observed after the T6 temper.