Rate-dependent strength and deformation heterogeneity of B4C-reinforced Al composite: Time-resolved imaging with synchrotron X-rays
Journal Article
·
· Ceramics International
- South China Univ. of Technology, Guangzhou (China); Southwest Jiaotong Univ., Chengdu (China)
- Southwest Jiaotong Univ., Chengdu (China)
- Shanghai Jiao Tong Univ. (China). State Key Laboratory of Metal Matrix Composites
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- South China Univ. of Technology, Guangzhou (China)
Dynamic (up to 5500 s-1) and quasi-static compression tests are conducted on a 15 wt% B4C particle-reinforced Al (B4C/Al) composite. In situ, high-speed synchrotron X-ray phase contrast imaging and digital image correlation are employed to map mesoscale deformation fields at μm and μs scales. The bulk stress–strain curves show significant strain and strain-rate hardening under dynamic compression. The strain-rate sensitivity exponent is an order of magnitude higher at high strain rates (> 103 s-1) than that at low strain rates (< 10-2 s-1). Strain field mapping demonstrates distinct compressive strain localizations for both quasi-static and dynamic loading. Nevertheless, compressive strain localizations appear denser in spacing under dynamic loading, owing to spontaneous dislocation nucleation in both weak and strong zones. This results in a higher density of geometrically necessary dislocations, which contributes to the higher strain and strain-rate hardening of B4C/Al under dynamic loading. Additionally, the ratio of the maximum local strain to the bulk average is 1.5, and the local strain-rate enhancement cannot explain the increased rate sensitivity of B4C/Al under dynamic loading. Therefore, the rate-dependent deformation heterogeneity dominates the strain-rate hardening of B4C/Al. Postmortem analyses help correlate deformation features to particle- and grain-scale microstructures, yielding consistent results with mesoscale strain fields.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1834634
- Alternate ID(s):
- OSTI ID: 1815247
- Journal Information:
- Ceramics International, Journal Name: Ceramics International Journal Issue: 11 Vol. 47; ISSN 0272-8842
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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