タイトル（掲載誌）Materials Science and Engineering A
一般注記The effect of additional solute magnesium (Mg) on mechanical and high-cycle-fatigue properties of 6061-T6 aluminum alloy is investigated in detail. By adding 0.5% and 0.8% Mg to the 6061-T6 alloy with a normal stoichiometric Mg2Si composition (base alloy), the alloy exhibits eminent strain-aging characteristics demonstrated by the emergence of serrated flow, the negative strain-rate-sensitivity and relatively weakened temperature dependency of flow stress. The Mg-added new alloy also shows higher work-hardening rate than the base alloy particularly at initial flow regime and at lower strain rate. The S-N curve of the new alloy shows a clear fatigue limit which is absent in the base alloy. The fatigue limit of the new alloy is shown to be controlled by the threshold against small crack growth. Moreover, the new alloy clearly exhibits a coaxing phenomenon (time-dependent strengthening) which is absent in the base alloy. The coaxing effect is attributed to the existence of a small quasi-non-propagating crack whose growth resistance gradually increases during stress amplitude step-ups.
This study was financially supported in part by the Kansai University Grant-in-Aid for progress of research in graduate course (2012) and also by the Kansai University Expenditures for Support of Training Young Scholars (2013).
著作権情報This is a preprint submitted to Materials Science and Engineering: A. Publisher's version is available from http://doi.org/10.1016/j.msea.2015.06.051.
(C) Elsevier
異版（DOI）10.1016/j.msea.2015.06.051
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）