Abstract
Peak magnetostriction of Fe100-xGax with x around 27 has been attributed to shear modulus softening, analogues to the scenario for a martensitic transformation. Recently, stress-induced local six-layer modulated monoclinic (6 M) martensites have been investigated in Fe-Ga alloy. To identify the spontaneous martensitic transformation behavior, here we performed a comparative study of a Fe74Ga26 alloy with lower D03 ordering degree at the quenched state and with higher D03 ordering degree after subsequent long-term aging. In comparison with the quenched state that bears no martensites, the aged one undergoes spontaneous martensitic transformation upon cooling, and local 6 M martensites are observed after heating from liquid nitrogen temperature to room temperature. It is found that both the ordering degree and the structural stability of D03 phase are significantly improved after long-term aging, which makes the temperature-induced martensites visible. The present finding verifies that martensitic transformation is a universal phenomenon in the magnetostrictive Fe-Ga alloy.
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