Influence of 3D connectivity of rigid phases on damage evolution during tensile deformation of an AlSi12Cu4Ni2 piston alloy

Abstract

Influence of 3D connectivity of rigid phases on damage evolution during tensile deformation of an AlSi12Cu4Ni2 piston alloy, Materials Science & Engineering A,

Revealing the Effect of Local Connectivity of Rigid Phases during Deformation at High Temperature of Cast AlSi12Cu4Ni(2,3)Mg Alloys

“…The sXCT results show that primary Si clusters play a major role in damage formation during tensile deformation at 300 °C, as it has also been observed at room temperature during a previous in-situ study of the tensile behavior of a similar alloy [16]. Both alloys studied in this work display large clusters of primary Si (V primary Si ≥ 34,500 µm 3 , see Figure 6).…”

Explaining Deviatoric Residual Stresses in Aluminum Matrix Composites with Complex Microstructure

“…Many other improvements to the model can be made, for instance related to the shapes of the inhomogeneities. Indeed, approximating the complicated shapes observed by computed tomography [34,[40][41][42] by ellipsoids of revolution may produce errors in the determination of stresses. [43,44] The real shapes of the inhomogeneities are quite irregular, may be concave and form clusters.…”

On the Role of Hazard and Particle Failure Statistics on the Variation of Fracture Parameters of Ductile-Brittle Composites

“…Even for a pure polycrystalline material, one can distinguish ductile and brittle fracture, voids growth, transgranular and intergranular failure, shear band decohesion, crack nucleation due to twin interaction [1][2][3][4][5]. Non-homogeneous materials, such as metal-matrix composites, envisage yet a larger spectrum of failure modes, including cleavage of brittle particles embedded in a ductile matrix and matrix-particle decohesion [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…In this framework, the numerical simulations were mainly based on the "void cell computations" suggesting either periodic arrays of cells with spherical particles or more complex (but also regular) arrangements including several families of cells of different size, cells containing several voids, and variation of the voids shape [26][27][28][29][30][31]. On the other hand, numerous experiments showed that the fracture of composites depend on the heterogeneous distribution of particle sizes, shapes, and interparticle spacing, as well as the associated topology of the second phase [6][7][8][9][10][11][12][13][16][17][18][19][20][21][22][32][33][34]. Models considering real particle arrangements made it possible to examine the role of the material heterogeneity, in particular, the particles clustering and complex interconnected topologies, as well as the statistical aspect of fracture [17,[35][36][37][38][39][40][41].…”

“…The reason for the choice of this alloy for mechanical tests was two-fold. On the one hand, both the mechanical properties and microstructure of Al-Si alloys have been documented in the literature due to their wide applications (e.g., [6][7][8][9][10][11][12][13][17][18][19][20][21][22]41,45]). On the other hand, it is known that heat treatment can efficiently transform the interconnected coral-like Si phase characterizing the as-cast eutectic alloy into isolated particles with close-to-spherical shape [9,32,48].…”