TY - JOUR
T1 - Cold sprayed AA2024/Al2O3 metal matrix composites improved by friction stir processing
T2 - Microstructure characterization, mechanical performance and strengthening mechanisms
AU - Yang, Kang
AU - Li, Wenya
AU - Niu, Pengliang
AU - Yang, Xiawei
AU - Xu, Yaxin
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/3/5
Y1 - 2018/3/5
N2 - In this study, friction stir processing (FSP) was employed as the strengthening method to modify the microstructure and mechanical properties of cold sprayed AA2024/Al2O3 metal matrix composites. Scanning electron microscopy and optical microscopy identify that FSP improves notably the refinement and dispersion of Al2O3 particles. Nanoindentation results show that the hardness and elastic modulus of cold sprayed AA2024 particles decrease with FSP, which are mainly attributed to the dissolution of the Guinier Preston Bagaryatskii (GPB) zone. Higher Vickers hardness values are reached for the FSPed specimens due to the uniform distribution and refinement of reinforcing particles. The tensile properties of cold sprayed AA2024/Al2O3 composites are remarkably enhanced by FSP, with an increase of 25.9% in the ultimate tensile strength and 27.4% in elongation. The improved interparticle bonding and the dispersion strengthening of the refined Al2O3 particles are the main strengthening mechanisms responsible for these enhancements.
AB - In this study, friction stir processing (FSP) was employed as the strengthening method to modify the microstructure and mechanical properties of cold sprayed AA2024/Al2O3 metal matrix composites. Scanning electron microscopy and optical microscopy identify that FSP improves notably the refinement and dispersion of Al2O3 particles. Nanoindentation results show that the hardness and elastic modulus of cold sprayed AA2024 particles decrease with FSP, which are mainly attributed to the dissolution of the Guinier Preston Bagaryatskii (GPB) zone. Higher Vickers hardness values are reached for the FSPed specimens due to the uniform distribution and refinement of reinforcing particles. The tensile properties of cold sprayed AA2024/Al2O3 composites are remarkably enhanced by FSP, with an increase of 25.9% in the ultimate tensile strength and 27.4% in elongation. The improved interparticle bonding and the dispersion strengthening of the refined Al2O3 particles are the main strengthening mechanisms responsible for these enhancements.
KW - Cold spray
KW - Friction stir processing
KW - Mechanical properties
KW - Metal matrix composites
KW - Phase transformation
KW - Strengthening mechanisms
UR - https://www.scopus.com/pages/publications/85034109558
U2 - 10.1016/j.jallcom.2017.11.132
DO - 10.1016/j.jallcom.2017.11.132
M3 - 文章
AN - SCOPUS:85034109558
SN - 0925-8388
VL - 736
SP - 115
EP - 123
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -