J041031 7075 アルミニウム合金の高強度化への結晶粒微細化の効果([J04103]工業材料の変形と強度特性及びそのモデル化(3))

概要

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A7075 is one of most high-strength material in the aluminum alloys. And so, it was one of the beneficial solutions to energy problem to use the sheet of high strength aluminum alloys. In this study, The alloys was grain refined by multi-axial alternative forging and warm rolling combined by intermediate thermo-mechanical treatment and the microstructure, hardness and tensile yield strength were investigated. The sever plastic deformed samples with grain size between 150 and 200 nm were machined to tensile specimens with their tensile direction parallel to the rolling direction. The yield stress and tensile strength were shown that 470 MPa and 520 MPa respectively. In fact, high strength A7075 alloy was proved by rolling. The relationship of the rolling temperature and high strength were researched the rolling temperature at 292 K, 373 K and 474 K. As result, rolling temperature at 293 K was the highest strength. In other words, strength improved by cold rolling, But, it was not lead to improvement of the elongation.
一般社団法人日本機械学会の論文
2011-09-11