Abstract
The Al-Nb/Ti/Ni composite was fabricated from pure Al, Ni, Ti, and Nb sheets by the ARB technology. The microstructure evolution was observed by scanning electron microscopy, x-ray diffraction, and transmission electron microscopy. The evolution was evaluated by the electron backscattered diffraction (EBSD) technique. A couple of results we obtained showed that the microstructure of Al changed from equiaxed grains to a lamellar structure, and the grain size in the ND decreased gradually. Finally, the average grain size in the ND was 0.31 μm. Additionally, the fraction of HAGBs increased after the third pass, resulting from the dynamic recovery and the shear bands. The texture evolution was tested by electron backscattered diffraction. After the fourth pass, the Al exhibited a combination texture of rolling texture and shear texture. The rolling texture components were composed of Copper{112}<111>, Dillamore{4 4 11}<11 11 8>, S{123}<634>, and Brass{011}<211>, and the shear texture components were Rotated Cube {001}<110> and {111}//ND. The microhardness of Ni, Ti, Nb, and Al was improved in the ARB process and finally reached 226.4, 246.3, 187.2, and 44.2 HV, respectively.
Highlights
Metal matrix composites (MMC) combine the advantages of each component and makes up for the shortcomings, which has excellent comprehensive properties that cannot be matched by a single metal or alloy so that it becomes a focus in materials science today
Microstructure evolution of the Al-Nb/Ti/Ni composite was observed by scanning electron microscopy (SEM, JSM7001F) and transmission electron microscopy (TEM, JEM2010, 200 kV). e texture evolution of the Al layer in the accumulative roll bonding (ARB) process was analyzed using an electron backscattered diffraction (EBSD) technique, and the EBSD test was conducted at a scanning electron microscopy (SEM, JSM-7001F) equipped with a TSL-OIM EBSD analysis system. e EBSD measurements were performed at a voltage of 20 kV, a tilt angle of 70°, a magnification of 2500, and a scan step size of 0.06 microns. e EBSD samples were electropolished in an ethanol and perchloric acid (5 vol.%) solution at 20 V for 20∼30 s. e microhardnesses (HV) of Chemical composition
(1) Nickel, titanium, and niobium fragments were homogeneously distributed in the multimetal composite, and the average size of Nb fragments was smaller than the other two
Summary
E microstructure evolution was observed by scanning electron microscopy, x-ray diffraction, and transmission electron microscopy. E evolution was evaluated by the electron backscattered diffraction (EBSD) technique. A couple of results we obtained showed that the microstructure of Al changed from equiaxed grains to a lamellar structure, and the grain size in the ND decreased gradually. The average grain size in the ND was 0.31 μm. The fraction of HAGBs increased after the third pass, resulting from the dynamic recovery and the shear bands. E texture evolution was tested by electron backscattered diffraction. The Al exhibited a combination texture of rolling texture and shear texture. E microhardness of Ni, Ti, Nb, and Al was improved in the ARB process and reached 226.4, 246.3, 187.2, and 44.2 HV, respectively
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