Precipitation kinetics in quenched and slowly cooled Pb–1.5wt% Sb alloy specimens

Fawzy, A.; Awadallah, A.; Sobhy, Mohammed; Saad, Gamal R.

doi:10.1016/j.physb.2004.11.011

“…6.11b). that in both Pb-1.5Sb [190,191] and Pb-10Sn [192,193] alloys the experimental data are in good agreement with the DSD curve expressed by Eq. (6.22).…”

Section: Validation Of the Constitutive Equation Developedsupporting

confidence: 75%

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

Shaha¹

2021

Preprint

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High temperature tensile, compression and low cycle fatigue tests were performed to assess the influence of micro-additions of Ti, V and Zr on the Al-7Si-1Cu-0.5Mg (wt.%) alloy in the as-cast and heat treated conditions. A combination of electron microscopy and high temperature X-ray diffraction was used to identify phases and temperature ranges of their thermal stability. The microstructure of the as-cast Al-7Si-1Cu-0.5Mg (wt.%) base and modified alloys consisted of α-Al, eutectic Si, and Cu-, Mg- and Fe-based phases Al2.1Cu, Al8.5Si2.4Cu, Al7.2Si8.3Cu2Mg6.9 and Al14Si7.1FeMg3.3. In addition, the micro-sized Ti/V/Zr-rich phases Al6.8Si1.4Ti, Al21.4Si4.1Ti3.5VZr3.9, Al6.7Si1.2TiZr1.8, Al2.8Si3.8V1.6Zr and Al5.1Si35.4Ti1.6Zr5.7Fe were identified in the modified alloys. During solution treatment, Cu- and Mg- based phases were completely dissolved, while the eutectic silicon, Fe- and Ti-V-Zr-rich intermetallics partially dissolved. The TEM analysis confirmed the presence of nano-sized precipitates of (AlSi)3(TiVZr) with D023 tetragonal crystal structure. The tensile tests of the alloy in the as-cast state showed that with increasing testing temperature from 25°C to 400°C the yield strength and tensile strength of the studied alloy decreased from 161 MPa to 84 MPa and from 261 MPa to 102 MPa, respectively. Accordingly, the T6 heat treated alloy modified with additions of a higher content of Ti-V-Zr achieved the highest tensile strength of 343 MPa over the base alloy and alloys modified with additions of Ti, Ti-Zr and lower contents of Ti-V-Zr. The fatigue life of the studied alloy in the T6 condition was substantially longer than those of the reference alloys A356 and the same Al-7Si-1Cu-0.5Mg base alloy with lower additions of V, Zr and Ti in the T6 condition. The fractography revealed tensile crack propagation through the eutectic Si and primary phases, exhibiting intergranular fracture along with some cleavage-like features of the plate-shaped Ti-V-Zr-rich intermetallics with a presence of fatigue striations on the latter, indicating their ductile nature. It is believed that the intermetallic precipitates containing Zr, Ti and V improve the fatigue life of the studied alloy in the T6 condition.

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“…More interestingly, a number of previous investigations have demonstrated that the Hall-Petch relationships in different materials [6][7][8][9][10][11][12][13][14][15][16][17][18][19], characterized by the relation between microhardness and the inverse square root of microstructure, can yield different Hall-Petch slopes. That is, there may be more than one Hall-Petch slope in the entire range of microstructure for a given material.…”

Section: şAhin Et Al Mechanical Properties Of Directionally Solimentioning

confidence: 99%

“…The solidification processing parameters (G, V) of alloys directly affect λ 1 , λ 2 , and R of the alloys and also significantly influence their mechanical behaviors. Hence, the effects of solidification processing and microstructure parameters on mechanical behaviors have been studied intensively [6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of directionally solidified lead-antimony alloys

Şahin

¹

,

Kaya

²

2011

Int J Miner Metall Mater

6

1

0

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The Pb-17wt% Sb alloy was directionally solidified under two solidification conditions: with different temperature gradients (G=0.93-3.67 K/mm) at a constant growth rate (V=17.50 μm/s) and with different growth rates (V=8.3-497 μm/s) at a constant temperature gradient (G=3.67 K/mm) in a Bridgman furnace. Microstructure parameters, such as primary dendrite arm spacing (λ 1 ), secondary dendrite arm spacing (λ 2 ), and dendrite tip radius (R), were measured. The microhardness (Hv) and ultimate tensile strength (σ) of the directional solidification samples were also measured. The influences of solidification and microstructure parameters on Hv and σ were investigated. The results obtained in this work were compared with similar experimental researches in literatures. It is shown that the Hv and σ values increase with the increase of G and V, but decrease with the increase of λ 1 , λ 2 , and R.

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“…(6.22) can be used to predict well the DSD of the alloys tested at a wide range of deformation temperatures. [190]; ‡ Sakr et al [191]; † El-Sayed et al [192];…”

Section: Validation Of the Constitutive Equation Developedmentioning

confidence: 99%

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

Shaha¹

2021

Preprint

0

View full text Add to dashboard Cite

High temperature tensile, compression and low cycle fatigue tests were performed to assess the influence of micro-additions of Ti, V and Zr on the Al-7Si-1Cu-0.5Mg (wt.%) alloy in the as-cast and heat treated conditions. A combination of electron microscopy and high temperature X-ray diffraction was used to identify phases and temperature ranges of their thermal stability. The microstructure of the as-cast Al-7Si-1Cu-0.5Mg (wt.%) base and modified alloys consisted of α-Al, eutectic Si, and Cu-, Mg- and Fe-based phases Al2.1Cu, Al8.5Si2.4Cu, Al7.2Si8.3Cu2Mg6.9 and Al14Si7.1FeMg3.3. In addition, the micro-sized Ti/V/Zr-rich phases Al6.8Si1.4Ti, Al21.4Si4.1Ti3.5VZr3.9, Al6.7Si1.2TiZr1.8, Al2.8Si3.8V1.6Zr and Al5.1Si35.4Ti1.6Zr5.7Fe were identified in the modified alloys. During solution treatment, Cu- and Mg- based phases were completely dissolved, while the eutectic silicon, Fe- and Ti-V-Zr-rich intermetallics partially dissolved. The TEM analysis confirmed the presence of nano-sized precipitates of (AlSi)3(TiVZr) with D023 tetragonal crystal structure. The tensile tests of the alloy in the as-cast state showed that with increasing testing temperature from 25°C to 400°C the yield strength and tensile strength of the studied alloy decreased from 161 MPa to 84 MPa and from 261 MPa to 102 MPa, respectively. Accordingly, the T6 heat treated alloy modified with additions of a higher content of Ti-V-Zr achieved the highest tensile strength of 343 MPa over the base alloy and alloys modified with additions of Ti, Ti-Zr and lower contents of Ti-V-Zr. The fatigue life of the studied alloy in the T6 condition was substantially longer than those of the reference alloys A356 and the same Al-7Si-1Cu-0.5Mg base alloy with lower additions of V, Zr and Ti in the T6 condition. The fractography revealed tensile crack propagation through the eutectic Si and primary phases, exhibiting intergranular fracture along with some cleavage-like features of the plate-shaped Ti-V-Zr-rich intermetallics with a presence of fatigue striations on the latter, indicating their ductile nature. It is believed that the intermetallic precipitates containing Zr, Ti and V improve the fatigue life of the studied alloy in the T6 condition.

show abstract

Precipitation kinetics in quenched and slowly cooled Pb–1.5wt% Sb alloy specimens

Cited by 11 publications

References 11 publications

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

Mechanical properties of directionally solidified lead-antimony alloys

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

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