The role of equiaxed particles on the yield stress of composites

Size dependent strengthening in particle reinforced aluminium

“…The 0.02% offset stress was, thus, chosen to characterize their yield point; this is admittedly a somewhat arbitrary definition but nevertheless The yield stress of the Al 2 O 3 -Al composites, defined as the 0.02% offset stress, depends strongly on the mean interparticle spacing, l: the smaller the interparticle distance the higher the yield stress, in agreement with many previous investigations (e.g. [5,[19][20][21][22]45]). We use the concept of geo- metrically necessary dislocations to rationalize this effect of size on the yield behaviour of the composites.…”

“…This also holds for its deformation in the presence of a reinforcing ceramic, since the precipitates are considerably smaller than the particles, thus their interaction with dislocation motion remains dominant. However, when the composite matrix is a pure metal or low strength alloy, and/or the size of the reinforcement is significantly reduced (typically below 10 µm) classic continuum theories break down since in this case there is a strong dependence of composite properties on reinforcing particle size [5,7,[19][20][21][22][23]. Modelling the constitutive behaviour of such composites has renewed interest in a dislocation approach to strengthening in particle reinforced composites due to its inherent dependence on length scale.…”

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

“…4 and Table 1. The particular interdependence has been noted in several other studies of particle reinforced metals [13,29,[65][66][67][68][69], and has been attributed primarily to the size dependent generation of geometrically necessary dislocations upon cooldown from the processing temperature [70,71]. The size dependence of the yield stress in the present composites is analysed in detail elsewhere [72].…”

The Mechanical Properties of Al3Ti/6061 Al Composite Materials under the Magnetic Field

“…By the software analysis, composite grain size d1 = 97 μm, 6061Al alloy grain size d2 = 350 μm. Al 3 Ti with the existence of α-Al, the following relationship (001) Al / / (001) Al3Ti, [001] Al / / [100] Al 3 Ti, Al 3 Ti with α-Al lattice constant mismatch of 5.2%, can easily become α-Al nucleation core to meet the total cell corresponds to the conditions, which indicates that Al 3 Ti can be used as a substrate of α-Al phase heterogeneous nucleation, and the experimental results also confirmed that due to the generation of Al 3 Ti, α branches in matrix crystal divided into small equiaxial crystal. It is the reflection of fine-grain strengthening mechanism in metal matrix composites the importance of the field.…”

“…This required to be tensile, compressive strength, wear resistance, good dimensional stability and thermal conductivity. Particle reinforced aluminum matrix composite materials with high specific strength and specific stiffness, excellent mechanical and physical properties, especially the in situ reaction of raw particles reinforced aluminum matrix composites, compared with the traditional plus method, with a small particle size, particle surface without pollution, clean interface, the interface combined with good and a series of advantages, and thus praised as breakthrough new technology and highly valued [1][2][3]. Al-K 2 TiF 6 new system is studied in magnetic field in situ by the reaction of Al 3 Ti particle reinforced aluminum matrix composites.the magnetic field in the metal solidification process for the development of new materials, optimize the material preparation process, improve the comprehensive quality of the metal material products and solve the technical problems of metal materials in the preparation process to provide new means and methods of its solidification process in materials the application will become the new direction of materials research [4][5][6].…”