Microstructure and Dynamic Compression Properties of PM Al6061/B4C Composite

Abstract

Aluminum 6061 matrix composite reinforced by 35 wt% B 4 C particle was fabricated by power metallurgy method. Then, the as-deformed composite was tested by quasi-static (0.001 s-1) and dynamic (760-1150 s-1) compression experiments. The Johnson-Cook plasticity model was employed to model the flow behavior. The damage mechanism of composite was analyzed through the microstructure observations. The results showed that the B 4 C particles exhibited uniform distribution and no deleterious reaction product Al 4 C 3 was found in the composite. Al6061/B 4 C composite showed high yield strength, moderate strain rate sensitivity and strain hardening under the dynamic loading, and a constitutive model under dynamic compression was established based on Johnson-Cook model, and accorded well with experimental results. The microstructure damage was dominated by particle fracture and interface debonding, and the dislocation was observed in the composite at a higher strain rate.

Temperature-Dependent SRS Behavior of 316L and Its Constitutive Model

“…Constitutive model is generally introduced to quantify the mechanical behavior of metallic material. Arrhenius [9], Johnson-Cook [10,11] and Zerrili-Armstrong [12] are commonly used to describe the relationship of stress-strain curve with strain rate and temperature. In addition, artificial neural network can also be put into the application to predict the stress-strain curves at different strain rates and temperatures, which is built on artificial intelligence technology [13].…”

Wear resistant aluminum alloy - B4C composites fabricated by rheo-casting and rolling process

“…4.0 μm during rolling process, while average size of the 20 μm particle was reduced to ca. 9.0 μm due to fracture and deformation during rolling process [22]. As the rolling reduction increased, the proportion of fine lamella increases.…”

“…Alizadeh et al prepared Al -B 4 C composite by hot extrusion and pointed out that the mechanical performance increased with the B 4 C volume fraction while plasticity decreased [21]. Chen et al prepared the Al6061−35 mass%B 4 C composite by powder metallurgy method, and the composite's hardness reached 157.3 HV after hot rolling [22]. The size of B 4 C particles in their study reduced significantly due to fracture and deformation during compression.…”

A modified Johnson-Cook model for dynamic behavior of spray-deposition 17 vol.% SiCp/7055Al composites at high strain rates

“…As compared with physics-based models, however, phenomenological constitutive models involve fewer material constants and require limited experimental data; they are always prioritized by the users to assess the stress-strain values of materials. Besides, the phenomenological constitutive models have been successfully adopted to describe the sophisticated flow behaviors of materials under larger loading forming conditions [20,21].…”

“…The Johnson-Cook (JC) constitutive model has been extensively employed in phenomenological constitutive models for its simple form and simplified calculation [21][22][23]. The JC model initially proposed by Johnson and Cook in 1983, has been adopted for large deformation, high strain rates and high temperature of metals [23][24][25].…”