FCC metal-like deformation behaviour of Ir$$_3$$Nb with the L1$$_2$$ structure
岡本 範彦*; 竹本 昌平*; Chen, Z. M. T.*; 山口 正剛; 乾 晴行*
Okamoto, Norihiko*; Takemoto, Shohei*; Chen, Z. M. T.*; Yamaguchi, Masatake; Inui, Haruyuki*
The deformation behaviour of Ir$$_3$$Nb with stoichiometric and off-stoichiometric compositions has been investigated as functions of crystal orientation and deformation temperature. The critical resolved shear stress (CRSS) for (111)[$$overline{1}$$01] slip in stoichiometric Ir$$_3$$Nb exhibits a marginal temperature dependence at all temperatures with neither strong negative temperature dependence at low temperatures nor positive (anomalous) temperature dependence at high temperatures. The CRSS for (111)[$$overline{1}$$01] slip exhibits orientation dependence, neither. The [$$overline{1}$$01] dislocation dissociates into the anti-phase boundary (APB)-type scheme and is observed to be smoothly curved on the (111) slip plane at all temperatures, indicating the planar core structure. This is exactly what is known for the perfect dislocation in many pure FCC metals and is the reason for the observed FCC metal-like deformation behaviour of Ir$$_3$$Nb. The absence of yield stress anomaly in Ir$$_3$$Nb is discussed in terms of anisotropy in planar fault energies and elastic constants calculated by first principles calculations and experimentally determined in the present study.
使用言語 : English
掲載資料名 : International Journal of Plasticity
: 97
:
ページ数 : p.145 - 158
発行年月 : 2017/10
出版社名 : Elsevier
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登録番号 : AA20170267
抄録集掲載番号 : 45000997
論文投稿番号 : 19235
Accesses  (From Jun. 2, 2014)
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パーセンタイル:26.29
分野:Engineering, Mechanical
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