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Neutron diffraction study on martensitic transformation under compressive stress in an ordered Fe$$_{3}$$Pt

規則化Fe$$_{3}$$Ptの圧縮応力下のマルテンサイト変態に関する中性子回折研究

福田 隆*; 山口 貴司*; 掛下 知行*; Harjo, S.   ; 中本 建志*

Fukuda, Takashi*; Yamaguchi, Takashi*; Kakeshita, Tomoyuki*; Harjo, S.; Nakamoto, Tatsushi*

We have studied the structure change of an ordered Fe$$_{3}$$Pt (degree of order $$sim$$0.75) under a compressive stress applied in the [001] direction by neutron diffraction. In the absence of the stress, the alloy exhibits a weak first order martensitic transformation at 90 K from the L1$$_{2}$$-type cubic structure to the L6$$_{0}$$-type tetragonal structure. Under the compressive stress of 100 MPa, the first order nature of the thermally-induced martensitic transformation was undetectable in the temperature range of between 70 K and 270 K. The first order nature of the stress-induced martensitic transformation was also undetectable in the stress range of between 6 MPa and 300 MPa when tested at 120 K and higher temperatures. Under these conditions, the lattice parameters change continuously both in the cooling process and in the stress-applying process. A significant stress-induced softening of lattice was observed between 120 K and 265 K but not at 93 K and 295 K.

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パーセンタイル:10.83

分野:Physics, Applied

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