A new nucleation mechanism of primary Si by like-peritectic coupling of AlP and Al4C3 in near eutectic Al–Si alloy

Liang, Yu; Liu, Xiangfa; Ding, Haimin; Bian, Xiufang

doi:10.1016/j.jallcom.2006.04.011

Cited by 24 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be seen from Figure 2 , as the cooling rate increases, the secondary dendrite arm spacing (SDAS) obviously decreases. This is due to the fact that with the increased cooling rate, both the critical nucleation radius and the nucleation activation energy decrease and the nucleation rate increases [ 8 , 9 , 10 ]. The high cooling rate results in higher temperature gradient at the leading edge of the solid–liquid interface, thereby leading to more heterogeneous nucleation and inhibiting the grain growth.…”

Section: Resultsmentioning

confidence: 99%

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Tian

Guo

et al. 2018

Materials

View full text Add to dashboard Cite

The effects of cooling rate 0.15, 1.5, 15, 150, and 1.5 × 105 °C/s on the microstructures and mechanical properties of Al-13Si-4Cu-1Mg-2Ni cast piston alloy were investigated. The results show that with an increase of solidification cooling rate, the secondary dendrite arm spacing (SDAS) of this model alloy can be calculated using the formula D = 47.126v − 1/3. The phases formed during the solidification with lower cooling rates primarily consist of eutectic silicon, M-Mg2Si phase, γ-Al7Cu4Ni phase, δ-Al3CuNi phase, ε-Al3Ni phase, and Q-Al5Cu2Mg8Si6 phase. With the increase in the solidification cooling rate from 0.15 to 15 °C/s, the hardness increased from 80.9 to 125.7 HB, the room temperature tensile strength enhanced from 189.3 to 282.5 MPa, and the elongation at break increased from 1.6% to 2.8%. The ε -Al3Ni phase disappears in the alloy and the Q phase emerges. The δ phase and the γ phase change from large-sized meshes and clusters to smaller meshes and Chinese script patterns. Further increase in the cooling rate leads to the micro hardness increasing gradually from 131.2 to 195.6 HV and the alloy solidifying into a uniform structure and forming nanocrystals.

show abstract

Section: Resultsmentioning

confidence: 99%

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Tian

Guo

et al. 2018

Materials

View full text Add to dashboard Cite

show abstract

“…Meanwhile, many researchers have mentioned that the addition of titanium would lead to the formation of the Al 3 Ti phase, which was the heterogeneous nucleus for α -Al grain. The addition of Al-Ti-C might lead to the formation of Al 4 C 3 in these aluminum alloys, which has also been taken as the nucleation core for the phases with silicon contained [38].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Microstructures and Tensile Properties of Recycled Al-Si-Cu-Fe-Mn Alloys with Individual and Combined Addition of Titanium and Cerium

et al. 2018

View full text Add to dashboard Cite

Individual and combined addition of Ti and Ce on the recycled Al-Si-Cu-Fe-Mn alloy was conducted. The microstructures and tensile properties of these fabricated alloys were investigated. In the case of Ti or Ce which was individually added, the added amount was ranging from 0.03 wt.% to 0.09 wt.%. The combined addition of Ti and Ce was set at the ratios of 1 : 1, 1 : 3, and 3 : 1 with a total amount of 0.12 wt.%. Microstructures and phases of these alloys were investigated by using an optical microscope, X-ray diffraction testing, and SEM coupled with EDS. The morphologies of these alloys were quantified by analyzing the SDAS value, length of secondary phases, and phases' distribution uniformity. Tensile testing was carried out for understanding the strengthen effect of the modification process. Results show that the addition of Ce was favorable to the strength and % elongation because the coarse needle-like phase and the polyhedral phase were effectively refined. Their SDAS values and distribution factor were remarkably declined with the increase of the Ce level. The Ti addition could also refine the secondary phases and SDAS values. But its effect was not as prominent as the addition of Ce. Combined addition of Ti and Ce elements at the ratio of 1 : 3 resulted in the samples reaching maximum comprehensive tensile properties. In this case, the short needle-like phase was uniformly distributed in the microstructure. Few polyhedral phases could be found in the Al-Si-Cu-Fe-Mn matrix. The strengthening of these fabricated materials was due to the grain refinement for α-Al and modification for coarse secondary phases. In addition, distribution uniformity of secondary phases was also changed by their modification effects.

show abstract

“…When TiC-Al 2 O 3 /Al ribbons were added, the average grain size of the TAASMT alloy decreased from 28.5μm to approximately 14.9μm (as shown in figure 8(b)). This grain refinement could be attributed to the in situ formation of TiC and Al 2 O 3 , which can act as nucleants for the grain refinement of Al alloys [44][45][46]. Simultaneously, the ultrasonic vibration treatment of the melt, generated many cavitation bubbles in it.…”

Section: The Microstructure Of Taasmt Alloymentioning

confidence: 99%

Refining and reinforcing effects of TiC-Al₂O₃/Al ribbons inoculant on Al–Si–Mg–Ti alloy

Liu¹,

Cui²,

Geng³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

In this study, TiC-Al2O3/Al ribbons inoculant were prepared by mechanical alloying, spark plasma sintering (SPS) and melt spinning. Adding 5vol.% TiC-Al2O3/Al ribbons to an Al-Si-Mg-Ti (ASMT) alloy melt significantly refined the α-Al grains from 28.5 μm to 14.9 μm. In addition, the morphology of the eutectic silicon were modified and optimized, changing from needle-like silicon to spherical silicon. Adding the TiC-Al2O3/Al ribbons significantly improved the mechanical properties of TiC-Al2O3/Al-Si-Mg-Ti (TAASMT) alloy, including its elastic modulus (EM), yield strength (YS), ultimate tensile strength (UTS) hardness, and elongation which were increased by 5.4%, 18.4%, 32.7%, 8.3%, and 62.3%, respectively. These increases in the mechanical properties could be attributed to the intracrystalline reinforcement of the Al2O3 and TiC nanoparticles, well-bonded particle/matrix interface, modification of the eutectic silicon phases, and synergistic effects of the Orowan strengthening, Coefficient of thermal expansion (CTE) mismatch strengthening, load transfer, grain refining strengthening, and geometrically necessary dislocations (GND) strengthening.

show abstract

A new nucleation mechanism of primary Si by like-peritectic coupling of AlP and Al4C3 in near eutectic Al–Si alloy

Cited by 24 publications

References 14 publications

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Characterization of Microstructures and Tensile Properties of Recycled Al-Si-Cu-Fe-Mn Alloys with Individual and Combined Addition of Titanium and Cerium

Refining and reinforcing effects of TiC-Al₂O₃/Al ribbons inoculant on Al–Si–Mg–Ti alloy

Contact Info

Product

Resources

About

A new nucleation mechanism of primary Si by like-peritectic coupling of AlP and Al4C3 in near eutectic Al–Si alloy

Cited by 24 publications

References 14 publications

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Effects of Solidification Cooling Rate on the Microstructure and Mechanical Properties of a Cast Al-Si-Cu-Mg-Ni Piston Alloy

Characterization of Microstructures and Tensile Properties of Recycled Al-Si-Cu-Fe-Mn Alloys with Individual and Combined Addition of Titanium and Cerium

Refining and reinforcing effects of TiC-Al2O3/Al ribbons inoculant on Al–Si–Mg–Ti alloy

Contact Info

Product

Resources

About

Refining and reinforcing effects of TiC-Al₂O₃/Al ribbons inoculant on Al–Si–Mg–Ti alloy