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An examination of microstructural evolution in a Cu-Ni-Si alloy processed by HPT and ECAP

Title
An examination of microstructural evolution in a Cu-Ni-Si alloy processed by HPT and ECAP
Author
Megumi Kawasaki
Keywords
CuNiSi alloy; Equal-channel angular pressing; Hardness; High-pressure torsion; X-ray diffraction
Issue Date
2013-08
Publisher
Engineering Mechanics and Materials
Citation
Materials Science & Engineering A, 2013, 576, pp.149 - 155
Abstract
Experiments were conducted to evaluate the evolution of hardness and microstructure in a commercial Cu-2.5Ni-0.6Si alloy (in wt%) after processing using High-Pressure Torsion (HPT) at room temperature with an imposed pressure of 6.0GPa and Equal-Channel Angular Pressing (ECAP) at 423K using a channel angle of 135 o . Hardness measurements, X-ray diffraction and transmission electron microscopy (TEM) were used for microstructural evaluation and the results show a general consistency between these various techniques. The changes in the crystallite size and the dislocation structure as a function of the number of HPT revolutions and ECAP passes are discussed and compared with the results of the TEM observations. The detailed microstructural observations show a gradual evolution with increasing numbers of revolutions and passes with a saturation after 3 turns of HPT but with no saturation attained in ECAP even after 12 passes because of the lower imposed strain.
URI
https://www.sciencedirect.com/science/article/pii/S0921509313003717http://hdl.handle.net/20.500.11754/50262
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2013.04.004
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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