Effect of HPT processing followed by long term natural ageing on mechanical and electrical properties of commercially pure Cu

Получена: 15 октября 2019; Исправлена: 29 октября 2019; Принята: 29 октября 2019
Эта работа написана на английском языке
Цитирование: A. Rijal, S.P. Singh, J. Han, M. Kawasaki, P. Kumar. Effect of HPT processing followed by long term natural ageing on mechanical and electrical properties of commercially pure Cu. Письма о материалах. 2019. Т.9. №4s. С.561-565
BibTex   https://doi.org/10.22226/2410-3535-2019-4-561-565

Аннотация

HPT processed sample have heterogeneous, which is graded along radial direction. It allows measurement of mechanical properties, such as hardness, and physical properties, such as electrical resistivity, as function of strain imposed during processing and hence helps establish structure-property relationship using lesser number of samples.Commercially pure Cu was processed through high-pressure torsion (HPT) up to a shear strain of 1000 and naturally aged for 1.75 years by keeping the samples under laboratory conditions. Hardness of the freshly processed samples monotonically increased with the HPT strain; however, the samples processed to a shear strain of 2 to 20 demonstrated a remarkable drop in the hardness values after the natural ageing. Interestingly, the natural ageing was not effective in changing the hardness of HPT processed samples strained up to very high shear strains. Electrical resistivity of the HPT processed samples after natural ageing showed a non-monotonous variation with the HPT strain, wherein it increased and then decreased and finally again started to increase with increasing shear strain. A discussion on the role of total length of boundaries, which was measured using electron back-scattered diffraction technique, and residual stresses, which was measured using X-ray diffraction, in determining hardness and resistivity is presented to qualitatively understand the origin of the non-monotonous variations of these two properties in the commercially pure Cu. It is suggested that besides residual stress, crystal defects, such as dislocations and vacancies, might also play important roles in determining the effect of HPT processing on resistivity of Cu.

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Финансирование

1. Ministry of Human Resource Development -
2. National Science Foundation of the United States - DMR-1810343
3. Department of Science and Technology, India - National Clean Coal Research and Development Program