TY - JOUR
T1 - Effect of High-Pressure Torsion on the Thermal and Mechanical Properties of La 62 Cu 12 Ni 12 Al 14 Bulk Metallic Glass
AU - Guo, Jing
AU - Joo, Soo Hyun
AU - Pi, Donghai
AU - Kim, Wooyeol
AU - Song, Yuepeng
AU - Kim, Hyoung Seop
AU - Zhang, Xiaohui
AU - Kong, Dan
N1 - Funding Information:
This work was supported by science foundation for the excellent youth scholars of Shandong Province of China (Grant No. ZR2016JL019), the national research foundation of Korea through the Korea-China young scientist exchange program, special support for post-doc creative funding in Shangdong Province and outstanding young talent fund of Shandong Agricultural University.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/3
Y1 - 2019/3
N2 - Even though bulk metallic glasses (BMGs) are generally brittle, they receive large plastic deformations of over 1000% shear strain without fracturing through the application of combined shear and hydrostatic stresses. In this study, the effects of the severe plastic deformation by high-pressure torsion (HPT) on the thermal and mechanical properties of La 62 Cu 12 Ni 12 Al 14 BMG are investigated. Crystallization is not detected during the HPT processes with 5, 15, and 30 revolutions. However, increase in glass transition temperature, crystallization temperature, fracture strength, and fracture strain, and decrease in the coefficient of thermal expansion and hardness due to the HPT process are found. These changes in the properties are attributable to the increased free volume that results from the rejuvenated structure in the HPT-processed BMG. In addition, the fracture in the HPT-processed La 62 Cu 12 Ni 12 Al 14 BMG proceeds through a softening mechanism in the microscale region.
AB - Even though bulk metallic glasses (BMGs) are generally brittle, they receive large plastic deformations of over 1000% shear strain without fracturing through the application of combined shear and hydrostatic stresses. In this study, the effects of the severe plastic deformation by high-pressure torsion (HPT) on the thermal and mechanical properties of La 62 Cu 12 Ni 12 Al 14 BMG are investigated. Crystallization is not detected during the HPT processes with 5, 15, and 30 revolutions. However, increase in glass transition temperature, crystallization temperature, fracture strength, and fracture strain, and decrease in the coefficient of thermal expansion and hardness due to the HPT process are found. These changes in the properties are attributable to the increased free volume that results from the rejuvenated structure in the HPT-processed BMG. In addition, the fracture in the HPT-processed La 62 Cu 12 Ni 12 Al 14 BMG proceeds through a softening mechanism in the microscale region.
KW - fracture
KW - hardness
KW - high-pressure torsion
KW - thermal expansion
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U2 - 10.1002/adem.201800918
DO - 10.1002/adem.201800918
M3 - Article
AN - SCOPUS:85059279852
VL - 21
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
SN - 1438-1656
IS - 3
M1 - 1800918
ER -