Abstract
In the present work, the in-situ TiB2/Al12Si4Cu2NiMg (denoted as ‘Al-12Si’) composites were successful synthesized through the salt-metal reaction route. The influences of weight fraction (0, 4, and 9 wt.%) and heat treatment (T5 and T7) on the tensile creep deformation were studied at ≥623 K under constant load in air. At the investigated temperature and stress condition, TiB2 particles increased creep deformation resistance, as compared to the unreinforced alloy, while the composites presented similar strength when the weight fraction of reinforcement increased from 4% to 9%. It was found that the steady-state creep rate was lower in the 4 wt.% TiB2/Al-12Si composite (T5), as compared with that in the 4 wt.% TiB2/Al-12Si composite (T7). The result has been rationalized by using the load-partitioning model and relative to the evolution of the rigid phase. The creep deformation of the 4 wt.% TiB2/Al-12Si composite was controlled by the climb of dislocations in the aluminum alloy matrix.
Highlights
Reinforced aluminum matrix composites (DRAMCs) have received growing interests as the potential structural materials for high-temperature applications, such as aerospace, automotive, and manufacturing fields, due to their high specific strength, modulus, and several other favorable characteristics [1,2,3,4,5,6,7]
The present results have indicated that the brief Stage II is not an intrinsic property i.e., ZL109 [2], 2124 Al [11], and 2024Al [34], which has been stated as a parabola shape creep curve of all Discontinuously reinforced aluminum matrix composites (DRAMCs) corresponding alloys, as have reported in Reference
The creep improvement exhibited by the composites has obviously signified the effect of ceramic particulate on creep behavior
Summary
Reinforced aluminum matrix composites (DRAMCs) have received growing interests as the potential structural materials for high-temperature applications, such as aerospace, automotive, and manufacturing fields, due to their high specific strength, modulus, and several other favorable characteristics [1,2,3,4,5,6,7]. The composites, reinforced by nano-sized TiCx particles, has been reported by Wang et al [19], with about 4–15 times higher creep resistance ability than those of the unreinforced matrix alloy. The presence of the reinforcement, in some cases, may be detrimental by preferentially promoting damage [20,21], such as acting as dislocation
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