Creep and substructure in 5 vol.% SiC–2124 Al composite

Effect of in situ TiB2 particle reinforcement on the creep resistance of hypoeutectic Al–12Si alloy

“…The DRAMCs show high values of the apparent stress exponent and apparent activation energy for steady state creep at elevated temperature [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. These results are inconsistent with the existing theoretical and phenomenological models for dislocation creep.…”

“…These results are inconsistent with the existing theoretical and phenomenological models for dislocation creep. Recently, the threshold stress approach is widely used to interpret the high stress exponent and activation energy for the creep of DRAMCs [3][4][5][6][7][8][9][10][11][12][13][17][18][19]. Although many investigations on ceramic particles reinforced MMCs are available in the literature, little work is performed on the creep behavior of in situ particle reinforced aluminum matrix composites [8].…”

Creep behavior of hot extruded Al-Al2O3 nanocomposite powder

“…Galano et al [29] and showed that the apparent true stress exponent was ∼7, which can be associated with a deformation process controlled by dislocation mechanisms. Although the creep behavior of Al based composites has widely been studied and deformation features and mechanisms involved therein been known [30][31][32][33][34], literature review indicates that a limited studies have been performed on the creep behavior of Al-Al 2 O 3 nanocomposites processed by mechanical milling and direct powder extrusion process. Previous studies had a focus on the creep behavior of aluminum alloys reinforced with carbides such as SiC and Al 3 C 4 which were fabricated ex situ [30] or in situ [35].…”

“…Although the creep behavior of Al based composites has widely been studied and deformation features and mechanisms involved therein been known [30][31][32][33][34], literature review indicates that a limited studies have been performed on the creep behavior of Al-Al 2 O 3 nanocomposites processed by mechanical milling and direct powder extrusion process. Previous studies had a focus on the creep behavior of aluminum alloys reinforced with carbides such as SiC and Al 3 C 4 which were fabricated ex situ [30] or in situ [35]. The results of these studies have shown that aluminum alloys containing unshearable dispersions exhibit a superior creep resistance at elevated temperatures due to the presence of a threshold stress ( th ), below which the strain rate is assumed to be negligible [3,36].…”

High-Temperature Deformation and Ductility of a Modified 5083 Al Alloy

“…The majority of these studies have investigated alloys produced by ingot metallurgy (IM) (Ref [19][20][21][22][23][24][25][26][27]; others have also examined the high-temperature deformation of alloys produced by powder metallurgy (PM) and of aluminum-based metal-matrix composites (Ref [28][29][30][31][32][33][34][35][36][37][38][39][40][41]. These materials are characterized by the presence of the threshold stress r o , resulting from the interaction of the finedispersed particles in these alloys with the moving lattice dislocations.…”