| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Innovative Process Design and Processing for Advanced Structural Materials
|
| Presentation Title |
K-7: Discontinuous Yielding Behavior Due to Twinning Accompanied by Abnormal Grain Growth in Fine-grained Copper |
| Author(s) |
Byeong-Seok Jeong, Woojin Cho, Siwook Park, Leeju Park, Keunho Lee, Heung Nam Han |
| On-Site Speaker (Planned) |
Byeong-Seok Jeong |
| Abstract Scope |
The equiaxed fine-grained copper specimen fabricated by powder injection molding supplemented with hot isostatic pressing showed a yield point phenomenon with Lüders-type deformation. Abnormal grain growth accompanied by twinning occurred only in the region swept by the Lüders band. Consequently, the microstructure of Lüders band region transformed into bimodal grain structure composed of fine grains and abnormally coarse grains containing a large amount of twin. The active variant of the twin formed during abnormal grain growth was identified through EBSD (electron backscatter diffraction). Afterwards, the strain accommodated by the twinning was calculated based on a phenomenological theory. Based on this result, it was confirmed that the strain burst caused by the sudden occurrence of a large amount of twin could cause the yield point phenomenon of the fine-grained copper specimen. |