Hot deformation behaviors and processing maps of B{sub 4}C/Al6061 neutron absorber composites

Journal Article · Wed Feb 15 00:00:00 EST 2017 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.12.014· OSTI ID:22689710

Li, Yu-Li ^[1]; Wang, Wen-Xian ^[1]; Zhou, Jun ^[1]; Chen, Hong-Sheng ^[1]

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1. School of Materials Science and Engineering, Taiyuan University Of Technology, Taiyuan 030024 (China)

In this study, the hot deformation behaviors of 30 wt.% B{sub 4}C/Al6061 neutron absorber composites (NACs) have been investigated by conducting isothermal compression tests at temperatures ranging from 653 K to 803 K and strain rates from 0.01 to 10 s{sup −1}. It was found that, during hot compression, the B{sub 4}C/Al6061 NACs exhibited a steady flow characteristic which can be expressed by the Zener-Hollomon parameter as a hyperbolic-sine function of flow stress. High average activation energy (185.62 kJ/mol) of B{sub 4}C/Al6061 NACs is noted in current study owing to the high content of B{sub 4}C particle. The optimum hot working conditions for B{sub 4}C/Al6061 NACs are found to be 760–803 K/0.01–0.05 s{sup −1} based on processing map and microstructure evolution. Typical material instabilities are thought to be attributed to void formation, adiabatic shear bands (ASB), particle debonding, and matrix cracking. Finally, the effect of the plastic deformation zones (PDZs) on the microstructure evolution in this 30 wt.% B{sub 4}C/Al6061 composite is found to be very important. - Highlights: •The hot deformation behavior of the 30 wt.% B{sub 4}C/Al6061 NACs was first analyzed. •The 3D efficiency map and the instability map are developed. •The optimum hot working conditions were identified and validated by SEM and TEM. •The hot deformation schematic diagram of 30 wt.% B{sub 4}C/Al6061 NACs is developed.

• OSTI ID: 22689710
• Journal Information: Materials Characterization, Vol. 124; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BORON CARBIDES
COMPRESSION
CRACKING
DEFORMATION
FLOW STRESS
HOT WORKING
MICROSTRUCTURE
NEUTRON ABSORBERS
NEUTRONS
PLASTICITY
PROCESSING
SCANNING ELECTRON MICROSCOPY
SHEAR
STEADY FLOW
STRAIN RATE
STRAINS
TEMPERATURE RANGE 0400-1000 K
TRANSMISSION ELECTRON MICROSCOPY
WORKING CONDITIONS