Effects of T6 Treatment, Tensile Temperature, and Mass Fraction of SiC on the Mechanical Properties of SiCp/6061Al Composites

Abstract

SiCp/6061Al composites have been developed and widely applied in many fields, such as automobile, aerospace, shipping, and so on. Considering heat treatment, service environment, and strength of composites, this paper comprehensively studies the mechanical properties of SiCp/6061Al composites with a large range of SiC mass fractions under T6 treatments and different tensile temperatures. SiCp/6061Al composites were successfully prepared by hot press sintering at various SiC mass fractions (0–30%), and the influences of SiC concentration and T6 treatment on the mechanical properties of composites were characterized via tensile tests at room temperature, 100, and 200 °C. Microstructure and fracture surfaces of composites with various SiC concentrations were further analyzed by optical microscope and SEM. The formula for the biggest critical reinforcement concentration for the saturated distribution of SiC is proposed to reveal the strengthening rule of different SiC concentrations. Results show that the effect of T6 treatment on the mechanical properties of composites is a marked increase in tensile strength and an obvious decrease in elongation. The increase in the SiC mass fraction, except at 30%, is able to bring an increase in tensile strength and a decrease in elongation, and the change of the elongation is insignification in T6-treated specimens. The tensile strength of T6-treated specimens decreases as temperature increases, and the composite has a maximum elongation at 100 °C.

Cutting Force Prediction Model for Elliptical Vibration Cutting SiCp/Al Based on Three-Phase Friction Theory

“…The cutting force model reflects the cutting characteristics and mechanical status, and it determines the machining status of the workpiece surface. The cutting force exceeds the yield strength of the material to deform unevenness or extrusion to cause the atom−forming chips to slide out along the rake surface [2]. However, this situation has changed.…”

“…To some extent, the frictional behavior of th can be characterized by cutting speed [7]. The speed of the tool relative to th can be expressed as: 1) and (2) show that the friction mechanism in EVC is d conventional turning and is more complicated due to the effects of vibration trajectory. The friction force is changed to a time−varying function at time effects of vibration and tool tip trajectory.…”

“…Various thermal expansion coefficients can be obtained by adjusting different volume fractions. This unique characteristic makes SiCp/Al widely used in many important technical fields such as aerospace, microelectronic packaging, and high-speed rail [2,3]. There are many technical methods derived from the processing of composite materials.…”

Comparative Study on the Corrosion Resistance of 6061Al and SiC3D/6061Al Composite in a Chloride Environment

“…In addition, high residual stresses are generated at the composite interface during the preparation process due to the mismatch of the expansion coefficient and other physical properties between the Al alloy matrix and the SiC particles. An increase in residual stress causes significant changes in the microstructure and properties of the Al alloys near the interface, which significantly reduces the corrosion resistance of the material [5][6][7][8]. To improve the corrosion resistance of the AMCs, SiC particles were made into threedimensional reticulated porosity SiC skeletons (SiC 3D ), and compounded with Al alloys to produce a SiC 3D /Al alloy composite [7][8][9].…”

“…An increase in residual stress causes significant changes in the microstructure and properties of the Al alloys near the interface, which significantly reduces the corrosion resistance of the material [5][6][7][8]. To improve the corrosion resistance of the AMCs, SiC particles were made into threedimensional reticulated porosity SiC skeletons (SiC 3D ), and compounded with Al alloys to produce a SiC 3D /Al alloy composite [7][8][9]. The stiffness of SiC 3D /Al alloy composite is superior to that of Al alloy material, and its toughness and structural integrity are superior to those of monolithic SiC ceramic materials.…”