軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
研究論文
6000系アルミニウム合金の冷間多軸鍛造と時効による微細組織変化と機械的特性向上
青葉 知弥小林 正和三浦 博己
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2017 年 67 巻 7 号 p. 277-283

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The microstructural evolution and changes in mechanical properties of 6000 series aluminum alloys during multi-directional forging (MDFing) and artificial aging were systematically investigated. The strength gradually increased with increasing cumulative strain. The MDFed sample up to a cumulative strain of ΣΔε=6 showed the yield strength of 252 MPa and the ultimate tensile strength of 282 MPa. MDFing evolved unique deformation texture at higher cumulative strain region. Artificial aging at 373 K and 393 K after MDFing caused moderate hardening, although softening took place over 423 K without any obvious hardening. The artificially aged sample at 393 K for 100 ks after MDFing exhibited well-balanced mechanical properties of 288 MPa yield strength and 313 MPa ultimate tensile strength with 18.9% plastic strain to failure. The MDFing and subsequent aging succesfully produced homogeneous ultrafine-grained structure with average (sub)grain size of 220 nm.

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© 2017 一般社団法人軽金属学会
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