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Effect of Cr micro-alloying on microstructure and mechanical properties of alumina whisker and graphene co-reinforced copper matrix composites.
- Source :
-
Journal of Alloys & Compounds . Jul2022, Vol. 909, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- This work attempted to strengthen the interfacial strength and mechanical properties of alumina whisker and graphene co-reinforced copper matrix composites by Cr matrix micro-alloying. Cr elements are observed to: (i) aggregate to form large particles rather than disperse uniformly in Cu matrix; (ii) disperse at interfaces between Cu matrix and reinforcements. The relative density, tensile strength, shear strength and compressive strength of the Cu-Cr composites were in direct proportional to Cr micro-alloying amount from 0 to 1.5 wt%. Increased Cr micro-alloying amount, on the one hand, can strengthen interfacial bonding between Cu matrix and reinforcements and thereby enhance the load transfer efficiency at interfaces; on the other hand, can yield obvious grain refinement, and thereby achieving grain boundary strengthening as well as twin boundary strengthening, which were considered as the dominant strengthening mechanisms of Cu-Cr composites. Besides, dislocation strengthening and solid-solution strengthening were also additional strengthening mechanisms of Cu-Cr composites. [Display omitted] • Cr micro-alloying can significantly improve the mechanical properties of Cu matrix composites. • Cr micro-alloying can strengthen interfacial bonding between Cu matrix and reinforcements. • Cr micro-alloying can yield grain refinement. • The strengthening mechanisms mediated by Cr micro-alloying were analyzed in detail. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 909
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 156470059
- Full Text :
- https://doi.org/10.1016/j.jallcom.2022.164804