Interfaces in alumina-fibre-reinforced aluminium piston alloys

Dudek, H.J.; Kleine, Andreas; Borath, R.; Neite, G.

doi:10.1016/0921-5093(93)90346-g

Cited by 27 publications

(7 citation statements)

References 13 publications

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“…the T6 composites by the addition of KAOWOOL fibers can be accounted for solely by the weakening of the aluminum matrix. Finally, we note that while similar reductions in tensile strength have been observed after T6 heat treatment of aluminum-silicon alloys reinforced with FIBERFRAX fibers, [1,9] Dudek et al [10] report an increase in tensile strength for essentially the same alloy as used in our investigation. However, they also observed that, after solutionizing and quenching, the hardness did not change during subsequent aging at 200 ЊC, a sure sign that the magnesium had been completely depleted from the matrix.…”

Section: Discussionsupporting

confidence: 68%

“…alloy. [6,9,10] The reaction product at the interface has been Note that for this study any small changes of aging kinetics studied by secondary ion mass spectrometry and transmisdue to the presence of the fibers [15] are not important because sion electron microscopy, and it was concluded that "a sig-(1) the alloy contains Si particles (ϳ10 to 12 pct) so the nificant fraction of the Fiberfrax fibers were converted to thermal stress-induced dislocation enhancement mechanism probably already operates, and (2) s Ϫ1 . For each condition, three specimens were tested to obtain average values of tensile strength.…”

Section: Introductionmentioning

confidence: 99%

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The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Baxter

Sachdev

1999

Metall Mater Trans A

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This study compares the effects of T5 and T6 heat treatment on the tensile strengths of both KAOWOOL fiber reinforced and unreinforced 339 aluminum. The 339 Al-T6 is stronger than 339 Al-T5 (as expected), but for a KAOWOOL/339 Al composite, the T5 condition is substantially stronger than the T6. The controlling parameter is the strength of the aluminum dendrites, which in turn is proportional to the concentration of magnesium retained in the dendrites. In the T5 condition, more than half of the magnesium is in the form of large intermetallics in both the unreinforced alloy and the KAOWOOL/ 339 Al composite. During a T6 heat treatment, magnesium in the intermetallics is redissolved. In the unreinforced T6 alloy, this additional magnesium is retained in and strengthens the dendrites. But in the T6 composite, the magnesium segregates extensively to the KAOWOOL/aluminum interfaces depleting and softening the dendrites. This factor alone is sufficient to account for the low strength of the T6 composites. The tensile strengths of both the T5 and T6 composites correspond to the calculated values for a perfectly bonded system.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Baxter

Sachdev

1999

Metall Mater Trans A

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“…Therefore, it is necessary to investigate the formation mechanism of MgO and MgAl 2 O 4 under normal melting conditions and their possibility of acting as substrates as the heterogeneous nucleation, which is the main purpose of this study. Furthermore, although many papers showed the interface of exogenous fiber or spinel/aluminum in aluminum‐based composites, there are few paper showing high‐resolution analysis of the interface of endogenous oxide and aluminum. In this study, the interface has been also investigated by high‐resolution analytical electron microscopy.…”

Section: Introductionmentioning

confidence: 99%

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Kim

2015

Surf. Interface Anal.

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Aluminum containing 4 wt.% magnesium was oxidized at a temperature for different oxidation times and analyzed by highresolution electron microscopy. A thin oxidized layer of about 5 μm, which is composed of MgO, forms at short oxidation time and gradually increases. High-resolution microstructures reveal that the oxidized layers are porous regardless of oxidation time. After extended oxidation time, discrete MgAl 2 O 4 particles formed as a result of the reaction of initially formed MgO, liquid aluminum, and oxygen introduced from air through the porous MgO. Furthermore, it is clear by high-resolution lattice images that MgAl 2 O 4 particles are covered with thin Al 2 O 3 , whereas MgO is bonded intimately to aluminum. Therefore, MgAl 2 O 4 particles that form naturally during oxidation are difficult to act as a direct substrate for nucleation of aluminum grains because of the coverage of Al 2 O 3 . In contrast, MgO shows the possibility of acting as a substrate for the aluminum nucleation. The formation mechanism of MgO and MgAl 2 O 4 and their possibility of acting as substrates for nucleation of aluminum grains suggest that atomic level bonding and mismatches of nucleant/nucleus metal should be considered for correct evaluation of the possibility of heterogeneous nucleation of metallic matrix on a potent nucleant.

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“…В настоящее время все большее внимание уделяется разработке математических моделей метаматериаловматериалов, обладающих необычными свойствами (см., например, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]). Одним из таких свойств является свойство ауксетичности -отрицательного коэффициента Пуассона, когда материал расширяется в поперечном направлении при растяжении в продольном.…”

Section: Introductionunclassified

Analysis of auxetic properties of the cell having finite size particles

Vasiliev¹

2013

LoM

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Представлены результаты аналитического исследования ауксетических свойств квадратной ячейки с частицами конечного размера, аналитическое и численное исследование интересного свойства такой ячейки (решетки) сжиматься в поперечном сечении (уплотняться) под сближающимися частицами и нагрузкой.Ключевые слова: ауксетические свойства; квадратная ячейка; частицы конечного размера.Auxetic properties of square cell of finite size particles are considered. Analytical and numerical solutions are given. An interesting property is demonstrated and studied: for some parameters the cell becomes thinner in cross section between two approaching particles and under pressure.

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Interfaces in alumina-fibre-reinforced aluminium piston alloys

Cited by 27 publications

References 13 publications

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Analysis of auxetic properties of the cell having finite size particles

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Interfaces in alumina-fibre-reinforced aluminium piston alloys

Cited by 27 publications

References 13 publications

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

The tensile strength of 339 aluminum reinforced with kaowool fibers: A comparison of T5 and T6 heat treatments

Formation of endogenous MgO and MgAl2O4particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Analysis of auxetic properties of the cell having finite size particles

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Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains