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Nano Al2O3P/6061 aging hardening characteristics of aluminum matrix composites research

Particle size was increased with the strengthening phase particles decreases, but the precipitation of higher energy diffusion path is along the grain boundary region, the grain size decreases, the increase in the number of cases, also will be a substantial number of grain boundaries improved, so that the diffusion path increased precipitation, and thus accelerate its diffusion. Therefore, nanoparticle reinforced composites with the enhanced phase particle content increased, the relative increase of second phase release rate, reaching peak aging time is relatively short, hence the artificial aging Tiaojishan Formation 504 075 8070 60 volume of 65 workers in charge ss4535l +0.3 - Il_. r0.6-tlI +0.9-tll = all:! l ◆ '▲ ● A ● 55 Tiaojishan Formation of a 45-state, the growth and spread of the precipitates are given sufficient energy as its driving force, thus making aluminum alloy excessive growth of the precipitates,[link widoczny dla zalogowanych], resulting in a decrease in the number of precipitates. Can also be seen from Figure 1, nano-particle reinforced aluminum matrix composite hardness of the content of the strengthening phase particles increases. This is mainly due to the following three factors: first is to add thermal expansion coefficient and the matrix material is not the same alumina particles, in the strengthening phase particles and matrix residual stress generated interface zone. The second factor for the grain refinement of the strengthening phase particles in the matrix does not have the solubility, and the matrix material between the non-integrated, so in the case of dispersed, for the alloy substrate the formation of recrystallization and grain growth than large impedance, allowing the aluminum alloy material produced during the heat treatment the phenomenon of grain refinement. To obtain higher hardness values. The third factor is the dispersion of nano-alumina particles dispersed uniformly in the aluminum alloy to strengthen the body of the nano-alumina particles can be seen as obstacles to dislocation motion, making movement of the dislocation can not be run through, but only by dramatically changing the 69) 7 , 69) (18.63) 05l0152025 aging time / hfb) x60 ℃ aging time / h aging time / h (c) lso ℃ (d) 200 ℃ Figure 16061 aluminum and different contents of strengthening phase AlO. r/6o61 composite material at different temperatures accelerated age-hardening curves of hardening phenomenon. It may also be seen that the peak aging time for all samples are the increase of aging temperature decreased, while the nano-particle reinforced composite materials, especially with the strengthening phase content increased,[link widoczny dla zalogowanych], the performance is even more evident. This is mainly because in addition to provide adequate temperature driving force, the strengthening phase particles and the interface of the aluminum alloy to produce high density of dislocations and more conducive to the precipitation of second phase, growth and proliferation. Can also be seen from Figure 1, 6061 aluminum alloy during aging at 160C maximum available peak aging hardness, and nano particles strengthening phase, the phase content regardless of how much to strengthen the composite peak aging temperature, hardness values were as to enhance the downward trend, due to the dislocation line in the temperature increase the curvature of moves to move forward, so that the stress required to move the dislocation increases, and can cause rapid strain hardening of matrix, thereby enhancing the overall hardness composites value. 3 Conclusions (1) the addition of nano-alumina particles on the material impact of accelerated aging, and with the increasing content of alumina particles,[link widoczny dla zalogowanych], accelerated aging effect is more evident. (2) nano-alumina particle reinforced aluminum matrix composite hardness of the content of the strengthening phase particles increases. References: [1] DuttaI, BourellDL. InfluenceofDislocationDensityandDistri-butionontheAgingBehaviorof6061AIcomposites [,[link widoczny dla zalogowanych], J]. ActaMet-aI1Mater. 1990.39 (6): lll7 a ll25. [2] KumaiS. HuJ, HigoY. eta1. HardnessCharacteristicsinAgedParticulateSIC/A356CastAluminiumAlloycompositesI-j]. Scri-taMetaI1Mater. 1992.27 (11): lO7 a ll0. [3] LinJS,[link widoczny dla zalogowanych], LiPX. WuRJ. AgingEvaluationofCastParticulate-Re-inforcedSiC/A12o24Composites [J]. ScritaMetal1. Mater. . 1993,28 (3) :281-286. Tin ◆ ▲ ● ◆. -. . ■ t ● ◆ ▲ ● \
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