Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Investigation of specimen size effects by in-situ microcompression of equal channel angular pressed copper. / Howard, C.; Frazer, D.; Lupinacci, A.; Parker, S.; Valiev, R. Z.; Shin, C.; William Choi, B.; Hosemann, P.
в: Materials Science and Engineering A, Том 649, 01.01.2016, стр. 104-113.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Investigation of specimen size effects by in-situ microcompression of equal channel angular pressed copper
AU - Howard, C.
AU - Frazer, D.
AU - Lupinacci, A.
AU - Parker, S.
AU - Valiev, R. Z.
AU - Shin, C.
AU - William Choi, B.
AU - Hosemann, P.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Micropillar compression testing was implemented on Equal Channel Angular Pressed copper samples ranging from 200. nm to 10. μm in side length in order to measure the mechanical properties yield strength, first load drop during plastic deformation at which there was a subsequent stress decrease with increasing strain, work hardening, and strain hardening exponent. Several micropillars containing multiple grains were investigated in a 200. nm grain sample. The effective pillar diameter to grain size ratios, D/. d, were measured to be between 1.9 and 27.2. Specimens having D/. d ratios between 0.2 and 5 were investigated in a second sample that was annealed at 200. °C for 2. h with an average grain size of 1.3. μm. No yield strength or elastic modulus size effects were observed in specimens in the 200. nm grain size sample. However work hardening increases with a decrease in critical ratios and first stress drops occur at much lower stresses for specimens with D/. d ratios less than 5. For comparison, bulk tensile testing of both samples was performed, and the yield strength values of all micropillar compression tests for the 200. nm grained sample are in good agreement with the yield strength values of the tensile tests.
AB - Micropillar compression testing was implemented on Equal Channel Angular Pressed copper samples ranging from 200. nm to 10. μm in side length in order to measure the mechanical properties yield strength, first load drop during plastic deformation at which there was a subsequent stress decrease with increasing strain, work hardening, and strain hardening exponent. Several micropillars containing multiple grains were investigated in a 200. nm grain sample. The effective pillar diameter to grain size ratios, D/. d, were measured to be between 1.9 and 27.2. Specimens having D/. d ratios between 0.2 and 5 were investigated in a second sample that was annealed at 200. °C for 2. h with an average grain size of 1.3. μm. No yield strength or elastic modulus size effects were observed in specimens in the 200. nm grain size sample. However work hardening increases with a decrease in critical ratios and first stress drops occur at much lower stresses for specimens with D/. d ratios less than 5. For comparison, bulk tensile testing of both samples was performed, and the yield strength values of all micropillar compression tests for the 200. nm grained sample are in good agreement with the yield strength values of the tensile tests.
KW - Grain size
KW - Mechanical properties
KW - Microcompression tests
KW - Scaling effects
UR - http://www.scopus.com/inward/record.url?scp=84943608733&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2015.09.110
DO - 10.1016/j.msea.2015.09.110
M3 - Article
AN - SCOPUS:84943608733
VL - 649
SP - 104
EP - 113
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
SN - 0921-5093
ER -
ID: 35164035