Softening of the Al-Mg-Si-Fe alloy under magnetostriction of FeAl microinclusions

Abstract

The physical origin of the magnetoplastic effect was experimentally identified in Al polycrystalline alloy. Exposure of the nominally pure industrial Al-Mg-Si-Fe alloy to magnetic field 0.7 T induces residual changes that provide a creep rate increase up to 25% and microhardness decrease down to 30%. FeAl inclusions of ∼1 μm size were revealed in the alloy. Magnetostriction of the ferromagnetic inclusions providing local mechanical stresses and generation of fresh dislocations in the vicinity of the inclusions is the main reason for magnetoplasticity. Ferro-, antiferro-, and paramagnetic contributions of the inclusions and/or Fe atoms distributed in the Al matrix have been distinguished. The chemical composition of FeAl inclusions determined by transition electron microscopy and local field probed by the Mossbauer technique are in good agreement with saturation magnetization of the FeAl alloys.

Influence of external influences on the creep of aluminum alloys with microscopic inclusions at room temperatures

“…Previously [14,15] an effect of static magnetic fields on mechanical properties of the material with inclusion in question has been found. Thus, after an exposure of specimens to a static magnetic field with an induction of 0.7 T the creep rate of polycrystalline Al with inclusions of Fe x Al x −1 increases by up to 25%.…”

Влияние Внешних Воздействий На Ползучесть Алюминиевых Сплавов С Микроскопическими Включениями При Комнатных Температурах

“…Ранее [14,15] было обнаружено влияние постоянных магнитных полей на механические свойства рассматриваемого материала с включениями. Так, после экспозиции образцов в постоянном магнитном поле с индукцией 0.7 T скорость ползучести поликристаллического Al, содержащего включения Fe x Al x −1 увеличивается до 25%.…”