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Träfflista för sökning "WFRF:(Zheng W.) ;lar1:(hj)"

Sökning: WFRF:(Zheng W.) > Jönköping University

  • Resultat 1-10 av 14
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1.
  • Du, Andong, et al. (författare)
  • On the efficient particle dispersion and transfer in the fabrication of SiC-particle-reinforced aluminum matrix composite
  • 2023
  • Ingår i: Crystals. - : MDPI. - 2073-4352. ; 13:12
  • Tidskriftsartikel (refereegranskat)abstract
    • Lightweight SiC-particle-reinforced aluminum composites have the potential to replace cast iron in brake discs, especially for electric vehicles. This study investigates the effect of SiC particle size and matrix alloy composition on the resulting transfer efficiency and particle distribution. The performance of a specially designed stirring head was studied using a water model, and the stirring head conditions were assessed to understand the particle transfer and dispersion mechanisms in the molten aluminum. The standard practice of thermal pre-treatment promotes the wetting of the reinforcing particles and commonly causes clustering before the addition to the melt. This early clustering affects the transfer efficiency and particle dispersion, where their interaction with the melt top-surface oxide skin plays an important role. In addition, the transfer efficiency was linked to the particle size and the chemical composition of the matrix alloy. Smaller particles aggravated the degree of clustering, and the addition of rare earth elements as alloying elements in the matrix alloy affected the particle dispersion. The stirring parameters should be selected to ensure cluster disruption when the carbides are added to the melt.
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2.
  • Du, A., et al. (författare)
  • On the hardness and elastic modulus of phases in SiC-reinforced Al composite : Role of La and Ce addition
  • 2021
  • Ingår i: Materials. - : MDPI. - 1996-1944 .- 1996-1944. ; 14:21
  • Tidskriftsartikel (refereegranskat)abstract
    • 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)3 Si2, Al20 (La,Ce)Ti2, and Al11 (La,Ce)3, π-Al8 FeMg3 Si6 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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3.
  • Du, A., et al. (författare)
  • Role of matrix alloy, reinforcement size and fraction in the sliding wear behaviour of Al-SiCp MMCs against brake pad material
  • 2023
  • Ingår i: Wear. - : Elsevier. - 0043-1648 .- 1873-2577. ; 530-531
  • Tidskriftsartikel (refereegranskat)abstract
    • Aluminium metal matrix composites were produced by a newly developed stirring device for stir casting with different matrix alloys, SiC particle fractions and sizes to investigate these parameters' influence on the materials' wear performance. The wear performance of the composites was evaluated with dry sliding pin-on-plate tests against a high-speed train brake pad, and the study of wear surfaces was completed by electron microscopy. The formation of an iron-based tribolayer during wear protected the metal matrix composite from further wear damage. The composite reinforced with 19% SiC particles sized 32 μm showed an increasing coefficient of friction during wear, and the wear surface showed traces of third body wear. The rare earth and transition metal added to the matrix alloy increased the hardness of the composite, and the intermetallic phases reduced the development of the Fe-based tribolayer. The composites with small SiC particles presented the Fe transfer on the exposed aluminium surface, with a lower wear rate and friction coefficient than other composites. The direct comparison of composites produced with different sizes of SiC particles highlighted that the relationship between the wear rate and the coefficient of friction of the composites and the brake pad showed a linear trend.
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4.
  • Du, Andong, et al. (författare)
  • The Influence of Ce, La, and SiC Particles Addition on the Formability of an Al-Si-Cu-Mg-Fe SiCp-MMC
  • 2022
  • Ingår i: Materials. - : MDPI. - 1996-1944 .- 1996-1944. ; 15:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Road transport and the associated fuel consumption plays a primary role in emissions. Weight reduction is critical to reaching the targeted reduction of 34% in 2025. Weight reduction in moving parts, such as pistons and brake disc rotors, provide a high-impact route to achieve this goal. The current study aims to investigate the formability of Al–Si alloys reinforced with different fractions and different sizes of SiCp to create an efficient and lightweight Al-MMC brake disk. Lanthanum (La) and cerium (Ce) were added to strengthen the aluminium matrix alloy and to improve the capability of the Al-MMC brake discs to withstand elevated temperature conditions, such as more extended braking periods. La and Ce formed intermetallic phases that further strengthened the composite. The analysis showed the processability and thermal stability of the different material’s combinations: increased particle sizes and broader size range mixture supported the formation of the SiCp particle interactions, acting as an internal scaffolding. In conclusion, the additions of Ce and La strengthened the softer matrix regions and resulted in a doubled compression peak strength of the material without affecting the formability, as demonstrated by the processing maps.
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5.
  • Du, A., et al. (författare)
  • The influence of la and ce on microstructure and mechanical properties of an al-si-cu-mg-fe alloy at high temperature
  • 2021
  • Ingår i: Metals. - : MDPI. - 2075-4701. ; 11:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The effect of lanthanum (La)+cerium (Ce) addition on the high-temperature strength of an aluminum (Al)–silicon (Si)–copper (Cu)–magnesium (Mg)–iron (Fe)–manganese (Mn) alloy was investigated. A great number of plate-like intermetallics, Al11 (Ce, La)3-and blocky α-Al15 (Fe, Mn)3Si2-precipitates, were observed. The results showed that the high-temperature mechanical properties depended strongly on the amount and morphology of the intermetallic phases formed. The precipitated tiny Al11 (Ce, La)3 and α-Al15 (Fe, Mn)3Si2 both contributed to the high-temperature mechanical properties, especially at 300◦C and 400◦C. The formation of coarse plate-like Al11 (Ce, La)3, at the highest (Ce-La) additions, reduced the mechanical properties at (≤300) °C and improved the properties at 400 °C. Analysis of the strengthening mechanisms revealed that the load-bearing mechanism was the main contributing mechanism with no contribution from thermal-expansion mismatch effects. Strain hardening had a minor contribution to the tensile strength at high-temperature.
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6.
  • Jarfors, Anders E.W. 1963-, et al. (författare)
  • On the In-Die Conditions and Process Parameter Settings in Indirect Squeeze Casting
  • 2022
  • Ingår i: Technologies. - : MDPI. - 2227-7080. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The current study investigated the relationship between the process settings and in-die conditions to understand the transitions between the different filling stages and the final pressure settings in indirect squeeze casting. A pressure sensor was placed in the die cavity to indirectly measure the evolution of pressure over time and monitor the filling process to study the in-die conditions. The pressure-time profile was analysed, and the maximum pressure and acceleration of the pressure were investigated empirically. The main conclusion of this paper is that the use of increasing intensification pressures is positive for the casting soundness. However, it must be stressed that there is a strong effect from the intensification pressure on the acceleration that has a far more reaching influence than the actual speed setting. A direct practical outcome is that a high intensification pressure has a more substantial effect than the second stage fill speed. This translates directly to a possibility of reducing the second stage fill speed to stabilise the fill front. Furthermore, this also pinpoints the need for improvements in hydraulics system designs to decouple the intensification pressure from the filling piston motion control.
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7.
  • Jarfors, Anders E.W. 1963-, et al. (författare)
  • On the Part Quality, Process Parameters and In-Die Pressures in Indirect Squeeze Casting
  • 2021
  • Ingår i: Technologies. - : MDPI. - 2227-7080. ; 9:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Squeeze casting is a process that can produce the highest quality castings. In the current study, the effect of the process settings and the in-die conditions on rejection rates is studied through a full-scale experimental study. Factors affecting the as-cast part quality were investigated in the current study from two different viewpoints. The first part of the study was to investigate the influence of the process settings on the part rejection rate, and the second was to understand the conditions in the die and the effects on the part rejection rate to understand better the reasons and sensitivity of the squeeze casting process.
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8.
  • Jarfors, Anders E.W. 1963-, et al. (författare)
  • On the sustainable choice of alloying elements for strength of aluminum-based alloys
  • 2020
  • Ingår i: Sustainability. - : MDPI. - 2071-1050. ; 12:3
  • Tidskriftsartikel (refereegranskat)abstract
    • Aluminum alloys are today entirely recyclable and are seen as a sustainable material. However, there are limitations in the use of aluminum from material strength and cost perspective. Nickel, copper and rare earth metals are alloying elements that may provide strength at room and elevated temperatures. These are, however, often seen as harmful from a sustainability viewpoint. Additionally, these alloying elements are commonly costly. The current paper makes an analysis of the sustainability-strength dimension of alloying, together with a cost perspective, to guide alloy producers and alloy users in making an educated choice of direction for future materials and material development.
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9.
  • Jarfors, Anders E.W. 1963-, et al. (författare)
  • Recent advances in commercial application of the rheometal process in China and Europe
  • 2019
  • Ingår i: Semi-Solid of Alloys and Composites. - : Trans Tech Publications. - 9783035713732 - 9783035733730 ; , s. 405-410
  • Konferensbidrag (refereegranskat)abstract
    • Recent advances in rheocasting have resulted in significant expansion in the types of products currently in full commercial production. The current paper gives an overview of components in production in Europe and in China produced using the RheoMetal™ process, that has taken the lead in a strong drive towards new heavy-duty applications made from aluminium alloys. In China, the dominating applications are found in the telecom industry. The trend in Europe is more towards marine and automotive applications commonly in fatigue loaded applications. The reason for the choice of rheocasting for complicated shape thin-walled electronics components with requirements is dominated by process yield and by the ability to improve thermal conductivity. The heavy-duty truck chassis thick walled components target weight reduction through design and to sustain fatigue load normally requiring forged components. Common in all applications are seen in production yield, reduced tool wear and reduction of die soldering.
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10.
  • Jarfors, Anders E.W. 1963-, et al. (författare)
  • Semisolid Materials Processing : A Sustainability Perspective
  • 2022
  • Ingår i: Solid State Phenomena. - : Trans Tech Publications. - 9783035717792 - 3035717796 ; , s. 287-292
  • Konferensbidrag (refereegranskat)abstract
    • Sustainable development is increasing in importance with restrictions on emission and carbon footprint. Similarly, both energy and resources efficiency is required, together with cost-efficiency. The current paper focuses on carbon footprint, energy usage, and material use efficiency of semisolid metal casting. A detailed analysis is made on the RheoMetal process, which is benchmarked against conventional HPDC casting. The analysis includes the gating system and the importance of the use of primary or secondary material. It furthermore includes a discussion of process yield and benefits based on process capability.
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