Investigation of strengthening mechanism in Ni-38Cr-3.8Al alloy with fine lamellar structure by in situ neutron diffraction analysis

被引：5

作者：

Koyanagi, Yoshihiko ^{[1
]}

Ueta, Shigeki ^{[1
]}

Kawasaki, Takuro ^{[2
]}

Harjo, Stefanus ^{[2
]}

Cho, Ken ^{[3
]}

Yasuda, Hiroyuki Y. ^{[3
]}

机构：

[1] Daido Steel Co Ltd, Corporated Res & Dev Ctr, Minami Ku, 2-30 Daido Cho, Nagoya, Aichi 4578545, Japan

[2] Japan Atom Energy Agcy, J PARC Ctr, 2-4 Shirakata, Tokai, Ibaraki 3191195, Japan

[3] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 773卷

关键词：

Ni alloy; Discontinuous precipitation; Lamellar structure; Neutron diffraction analysis; Hall-petch law; TENSILE DEFORMATION-BEHAVIOR; DISCONTINUOUS PRECIPITATION; CELLULAR PRECIPITATION; KINETICS; GAMMA; CHROMIUM; FE;

D O I：

10.1016/j.msea.2019.138822

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The strengthening mechanism of Ni-38Cr-3.8Al (mass%) alloy with fine lamellar structure composed of the gamma/gamma' and alpha-Cr layers, which is formed by discontinuous precipitation, was examined by in situ neutron diffraction analysis. The contribution of each constituent phase on the deformation behavior could be separated by the in situ analysis. The plastic deformation occurred preferentially in the gamma and gamma' phases, while the alpha-Cr phase deformed more elastically even beyond the yield point of the gamma and gamma' phases, which is similar to the cementite in pearlite of a steel. Fine nano-lamellar structure formed by the discontinuous precipitation is found to be mainly responsible for high strength of the alloys, while the influence of the gamma' precipitates on strength is likely to be small. Furthermore, the strengths of the alpha-Cr and gamma phases in the lamellar structure increased linearly with increasing inverse square root of the width of the alpha-Cr and the gamma phases, and therefore, the strengthening mechanism of this alloy is consistent with the Hall-Petch relationship of fine lamellar structure.

引用

页数：11

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