TY - JOUR
T1 - Micropillar compression deformation of single crystals of the intermetallic compound ς-FeZn13
AU - Okamoto, Norihiko L.
AU - Inomoto, Masahiro
AU - Adachi, Hiroki
AU - Takebayashi, Hiroshi
AU - Inui, Haruyuki
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Nos. 24246113 , 25630304 and 25709066 , and the Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan , and in part by the Advanced Low Carbon Technology Research and Development Program (ALCA) from the Japan Science and Technology Agency (JST) . This work was also supported by Research Promotion Grant from ISIJ and Grants for Technical Research from JFE 21st Century Foundation .
PY - 2014/2/15
Y1 - 2014/2/15
N2 - The deformation behavior of the f phase in the Fe-Zn system has been investigated by micropillar compression tests at room temperature with the use of single crystals with 13 different crystal orientations prepared by the focused ion beam method. Two different slip systems, {110}〈112〉 and (100)[001], are observed to operate. The critical resolved shear stresses (CRSS) value for {110}〈112〉 slip is more than three times smaller than that for (100)[001] slip. From the anisotropy in CRSS for these two slip systems, {110}〈112〉 slip is predicted to operate for most crystal orientations, except for a narrow orientation region around [305] where (100)[001] slip operates. The CRSS for {110}〈112〉 slip shows an inverse power-law scaling against the specimen size with an exponent of -0.517. The bulk CRSS value for {110}〈112〉 slip is estimated to be 62-76 MPa by taking into account the specimen size effects of CRSS. The reasons why {110}〈112〉 slip with a rather long Burgers vector (0.7700 nm) is selected as the easiest slip system are discussed in terms of the nature of atomic bonding in the crystal structure, especially the rigid atomic bonding within an Fe-centered Zn12 icosahedron (for slip plane selection), and the energetic barrier height along the slip direction and the resultant possible dissociation schemes (for slip direction selection). Some implications are made on how the deformability of the ς phase can be improved in the textured coating layer in galvannealed steels based on the results obtained.
AB - The deformation behavior of the f phase in the Fe-Zn system has been investigated by micropillar compression tests at room temperature with the use of single crystals with 13 different crystal orientations prepared by the focused ion beam method. Two different slip systems, {110}〈112〉 and (100)[001], are observed to operate. The critical resolved shear stresses (CRSS) value for {110}〈112〉 slip is more than three times smaller than that for (100)[001] slip. From the anisotropy in CRSS for these two slip systems, {110}〈112〉 slip is predicted to operate for most crystal orientations, except for a narrow orientation region around [305] where (100)[001] slip operates. The CRSS for {110}〈112〉 slip shows an inverse power-law scaling against the specimen size with an exponent of -0.517. The bulk CRSS value for {110}〈112〉 slip is estimated to be 62-76 MPa by taking into account the specimen size effects of CRSS. The reasons why {110}〈112〉 slip with a rather long Burgers vector (0.7700 nm) is selected as the easiest slip system are discussed in terms of the nature of atomic bonding in the crystal structure, especially the rigid atomic bonding within an Fe-centered Zn12 icosahedron (for slip plane selection), and the energetic barrier height along the slip direction and the resultant possible dissociation schemes (for slip direction selection). Some implications are made on how the deformability of the ς phase can be improved in the textured coating layer in galvannealed steels based on the results obtained.
KW - Dislocation structures
KW - Focused ion beam (FIB)
KW - Intermetallic compounds
KW - Plastic deformation
KW - Transmission electron microscopy (TEM)
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U2 - 10.1016/j.actamat.2013.10.065
DO - 10.1016/j.actamat.2013.10.065
M3 - Article
AN - SCOPUS:84897415693
VL - 65
SP - 229
EP - 239
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
ER -