Effects of Ce on the Thermal Stability of the Ω Phase in a Cast Aluminum Metal Matrix Composite

Melotti, F.; Dustan, A.; Hirst, T.; Griffiths, W.D.

doi:10.1002/9781119093367.ch17

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Table 2 summarises the at.% content range of the elements in the secondary phases identified with EDS. The values given in Table 2 were compared with the atomic composition reported in the literature [ 30 , 31 , 32 , 33 , 34 , 35 ]. The Al content can be higher than expected from the nominal composition because of the interaction volume of the matrix with the electric beam, with an acceleration voltage of 20 kV.…”

Section: Resultsmentioning

confidence: 99%

“…The crystal structure is tetragonal with six Al atoms and two Ti atoms in each unit cell, but the at.% content of Ti does not align with the composition in Table 2 . Melotti et al [ 33 ] reported the formation of the Al 20 CeTi 2 phase in a cast Al-MMC. The polygonal morphology and the composition in at.% align with those found in the present study ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

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On the Hardness and Elastic Modulus of Phases in SiC-Reinforced Al Composite: Role of La and Ce Addition

Lattanzi

Jarfors

et al. 2021

Materials

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The use of silicon carbide particles (SiCp) as reinforcement in aluminium (Al)-based composites (Al/SiCp) can offer high hardness and high stiffness. The rare-earth elements like lanthanum (La) and cerium (Ce) and transition metals like nickel (Ni) and copper (Cu) were added into the matrix to form intermetallic phases; this is one way to improve the mechanical property of the composite at elevated temperatures. The α-Al15(Fe,Mn)3Si2, Al20(La,Ce)Ti2, and Al11(La,Ce)3, π-Al8FeMg3Si6 phases are formed. Nanoindentation was employed to measure the hardness and elastic modulus of the phases formed in the composite alloys. The rule of mixture was used to predict the modulus of the matrix alloys. The Halpin–Tsai model was applied to calculate the elastic modulus of the particle-reinforced composites. The transition metals (Ni and Cu) and rare-earth elements (La and Ce) determined a 5–15% increase of the elastic modulus of the matrix alloy. The SiC particles increased the elastic modulus of the matrix alloy by 10–15% in composite materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

On the Hardness and Elastic Modulus of Phases in SiC-Reinforced Al Composite: Role of La and Ce Addition

Lattanzi

Jarfors

et al. 2021

Materials

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“…In addition to some improvements in thermal stability, there is also evidence of no beneficial effect of Ce additions. For example, after alloying of the A205/TiB 2 composite with 0.2-1.5 wt.% Ce, no influence on thermal stability of the Ω phase, tested at 230 • C for up to 100 h, was recorded [101]. It is claimed that cerium was located in the CeTi 2 Al 20 phase and poisoned the matrix grain refinement by nucleating around the TiB 2 particles.…”

Section: Influence Of Other Rare Earthsmentioning

confidence: 99%

Thermal Stability of Aluminum Alloys

Czerwiński

2020

Materials

116

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Thermal stability, determining the material ability of retaining its properties at required temperatures over extended service time, is becoming the next frontier for aluminum alloys. Its improvement would substantially expand their range of structural applications, especially in automotive and aerospace industries. This report explains the fundamentals of thermal stability; definitions, the properties involved; and the deterioration indicators during thermal/thermomechanical exposures, including an impact of accidental fire, and testing techniques. For individual classes of alloys, efforts aimed at identifying factors stabilizing their microstructure at service temperatures are described. Particular attention is paid to attempts of increasing the current upper service limit of high-temperature grades. In addition to alloying aluminum with a variety of elements to create the thermally stable microstructure, in particular, transition and rare-earth metals, parallel efforts are explored through applying novel routes of alloy processing, such as rapid solidification, powder metallurgy and additive manufacturing, engineering alloys in a liquid state prior to casting, and post-casting treatments. The goal is to overcome the present barriers and to develop novel aluminum alloys with superior properties that are stable across the temperature and time space, required by modern designs.

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Effects of Ce on the Thermal Stability of the Ω Phase in a Cast Aluminum Metal Matrix Composite

Cited by 2 publications

References 14 publications

On the Hardness and Elastic Modulus of Phases in SiC-Reinforced Al Composite: Role of La and Ce Addition

On the Hardness and Elastic Modulus of Phases in SiC-Reinforced Al Composite: Role of La and Ce Addition

Thermal Stability of Aluminum Alloys

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