TY - JOUR
T1 - Texture, microstructure and mechanical properties of AA7075-graphite composites produced through mechanical alloying and hot-extrusion
AU - Gutiérrez, E.
AU - Salazar, E.
AU - Salinas, A.
AU - Deaquino, R.
AU - Ponce, A.
AU - Yacaman, M.
AU - Alducin, D.
AU - Ortega, E.
AU - Bedolla, A.
AU - Fernández, B.
AU - Martínez, R.
AU - Garay, C.
N1 - Funding Information:
E. Salazar appreciates the financial support from CONACYT through the scholarship for a Master's degree under grant No. 573533 , and for the financial support through the student mobility program. E. Gutiérrez would like to thank CONACYT for the Cátedra assigned at the Institute of Metallurgy of the Autonomous University of San Luis Potosi (IM-UASLP). The technical assistance from Rosa Lina Tovar Tovar, Nubia Arteaga Larios, Izanami López Acosta, Francisco Botello Rionda and Felipe Márquez Torres is appreciated and recognized.
Funding Information:
E. Salazar appreciates the financial support from CONACYT through the scholarship for a Master's degree under grant No. 573533, and for the financial support through the student mobility program. E. Gutiérrez would like to thank CONACYT for the Cátedra assigned at the Institute of Metallurgy of the Autonomous University of San Luis Potosi (IM-UASLP). The technical assistance from Rosa Lina Tovar Tovar, Nubia Arteaga Larios, Izanami López Acosta, Francisco Botello Rionda and Felipe Márquez Torres is appreciated and recognized.
Publisher Copyright:
© 2023
PY - 2023/2/15
Y1 - 2023/2/15
N2 - This paper reports the effect of graphite and milling time on the texture, microstructure and mechanical properties of AA7075-graphite composites produced through mechanical alloying and hot extrusion. Characterization was conducted by scanning electron microcopy, transmission electron microscopy, X-ray diffraction, laser diffraction, electron backscatter diffraction and precession electron diffraction, and mechanical properties were evaluated by uniaxial tensile tests. Results show that particle and crystallite size of mechanically milled powders affect the grain size of extruded samples. Most of extruded samples exhibit deformation textures components, however, in-grain misorientation values were lower than 2°, which is an indicative of their recrystallization. The presence of deformation texture components in recrystallized samples is explained by the oriented nucleation mechanism. Hardness, yield strength (YS) and ultimate tensile strength increase, while elongation to fracture decreases, with the increase in graphite content and milling time. The size of recrystallized grains decreases with the increase in milling time and graphite content. Furthermore, YS varies with grain size according to the Hall-Petch relationship. Hardening of the investigated AA7075-graphite composites is enhanced by grain refinement, dispersion of Al4C3, Mg2Zn2 and Al2O3; and to a lesser extent by the random texture developed.
AB - This paper reports the effect of graphite and milling time on the texture, microstructure and mechanical properties of AA7075-graphite composites produced through mechanical alloying and hot extrusion. Characterization was conducted by scanning electron microcopy, transmission electron microscopy, X-ray diffraction, laser diffraction, electron backscatter diffraction and precession electron diffraction, and mechanical properties were evaluated by uniaxial tensile tests. Results show that particle and crystallite size of mechanically milled powders affect the grain size of extruded samples. Most of extruded samples exhibit deformation textures components, however, in-grain misorientation values were lower than 2°, which is an indicative of their recrystallization. The presence of deformation texture components in recrystallized samples is explained by the oriented nucleation mechanism. Hardness, yield strength (YS) and ultimate tensile strength increase, while elongation to fracture decreases, with the increase in graphite content and milling time. The size of recrystallized grains decreases with the increase in milling time and graphite content. Furthermore, YS varies with grain size according to the Hall-Petch relationship. Hardening of the investigated AA7075-graphite composites is enhanced by grain refinement, dispersion of Al4C3, Mg2Zn2 and Al2O3; and to a lesser extent by the random texture developed.
KW - AA7075-Graphite composite
KW - Electron backscattered diffraction
KW - Mechanical properties
KW - Precession electron diffraction
KW - Texture
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U2 - 10.1016/j.matchemphys.2023.127323
DO - 10.1016/j.matchemphys.2023.127323
M3 - Article
AN - SCOPUS:85146051832
SN - 0254-0584
VL - 296
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 127323
ER -