Creep behaviour of aluminium strengthened by fine aluminium carbide particles and reinforced by silicon carbide particulates — DS Al–SiC/Al4C3 composites

Creep behavior of hot extruded Al-Al2O3 nanocomposite powder

“…Similar behavior was observed for the creep behavior of Al-15 vol.% TiB 2 composite prepared by in situ method in the temperature range of 573-673 K [31]. It is important to note that the amount of threshold stress obtained in the present study is remarkably lower than those reported by Zhu et al [43] possibly due to lower amount of the reinforcement particles as well as differences exist in the substructure of the matrix. Examination of the creep rate of Al-Al 2 O 3 nanocomposite at 673 K revealed that the n-value and threshold stress decreased to 3 and 6.8 MPa, respectively (Fig.…”

“…Here, the threshold stress is 8.3 MPa, meaning that below this stress the strain rate is negligible. Zhu et al [43] reported that the invariant substructure model is valid for Al-Al 4 C 3 prepared by mechanical alloying and hot extrusion at 623 and 723 K. Values of 51 and 36 MPa were obtained for the threshold stress at those temperatures. They also showed that by increasing the volume fraction of Al 4 C 3 the detachment of dislocations from reinforcement took place more severely, i.e.…”

Creep Properties in TiO2 Nanoparticle Reinforced Aluminum Matrix Composites

“…The threshold stress is determined to be 162 MPa at 523 K, meaning that below this stress the creep rates become negligible. The applied stress dependence of the minimum creep strain rate can also be represented by the phenomenological equation as: [10] _ ekT [23] The rational explanations for the high threshold stress in the particle reinforced composite have been well documented: [24,25] (1) Orowan bowing of dislocations, (2) internal back stress associated with dislocation climb, (3) attractive force between dislocations and particles.…”

“…[8] These high stiffness reinforcements serve as effective barriers to dislocation motion and give rise to the threshold stress for creep. [10][11][12] The composites containing carbon nanotubes shows much enhanced creep resistance at the applied stresses higher than 200 MPa. [10][11][12] The composites containing carbon nanotubes shows much enhanced creep resistance at the applied stresses higher than 200 MPa.…”

Effect of Secondary Processing and Nanoscale Reinforcement on the Mechanical Properties of Al-TiC Composites

“…Composites have been considered as an important engineering material for potential applications in various industries from the days of their inception. During the last several decades, extensive research has shown tremendous promise of Metal Matrix Composites (MMCs) and a large number of conventional and innovative fabrication techniques have been developed to engineer composites for a diverse field of applications [1][2][3][4]. The most common choices for the matrix of a metal matrix composite have been aluminium, magnesium and titanium.…”