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Li Y.,Shandong University | Yang Y.,Shandong University | Wu Y.,Shandong University | Wang L.,Shandong Binzhou Bohai Piston Co. | Liu X.,Shandong University
Materials Science and Engineering A | Year: 2010

The different contributions of e{open}-Al3Ni, δ-Al3CuNi and γ-Al7Cu4Ni phases to the elevated-temperature strength of Al-Si piston alloys were investigated in this paper. Four kinds of Al-Si alloy containing different Ni-containing phases were prepared and their UTS values were obtained. The volume fractions and morphology characteristics of e{open}-Al3Ni, δ-Al3CuNi and γ-Al7Cu4Ni phases were calculated by the analysis of multicomponent phase diagrams and ImageJ software. The different contributions of e{open}-Al3Ni, δ-Al3CuNi and γ-Al7Cu4Ni phases to the elevated-temperature properties were analyzed. The δ-Al3CuNi phase was found to have the most effective volume utilization and possess the most efficient contribution to the elevated-temperature strength among the examined three Ni-containing phases, and the strip-like morphology was proved to be the most favorable morphology in the improvement of elevated-temperature strength. © 2010. Source


Zhang G.,Harbin Institute of Technology | Zhang G.,Shandong Binzhou Bohai Piston Co. | Zhang J.,Shandong University | Li B.,Shandong University | Cai W.,Harbin Institute of Technology
Materials Science and Engineering A | Year: 2013

Low-cycle fatigue tests were performed in an Al-Si piston alloy to manifest its remarkable double-stage hardening behavior and fracture characteristics. The first hardening was related to the interaction between the dislocations and the fine dispersive precipitates, and the second hardening was mainly caused by the dislocation/dislocation interaction. The fatigue fracture crack usually initiated from the large intermetallic colony which was close to the surface of specimen. The debonded Al-Si eutectic region and intermetallics provided a weak path for the crack propagation. The presence of intermetallics had a close relationship with the double-stage hardening behavior and brittle fracture characteristic at room temperature. A fatigue fracture model was comparatively put forward for the heavily alloyed Al-Si piston alloy to describe its fracture process in detail. © 2012 Elsevier B.V. Source


Gao T.,Shandong University | Li D.,Shandong University | Wei Z.,Shandong Binzhou Bohai Piston Co. | Liu X.,Shandong University
Materials Science and Engineering A | Year: 2012

The influence of Si addition on the microstructures and properties of ZrAlSi intermetallics in Al-xSi-2Zr alloys was investigated. With Si addition increasing from 3wt.% to 60%, ZrAlSi evolves from Zr(Al 1-mSi m) 3 (0.10≤m≤0.21) to Zr(Al nSi 1-n) 2 (0.05≤n≤0.15), the content of Si in ZrAlSi and microhardness of the intermetallics increase synchronously. Besides, all the ZrAlSi intermetallics exhibit flake-like morphology. The effect of Zr addition and precipitation of ZrAlSi intermetallics on the elevated-temperature properties of an Al-Si piston alloy was investigated, and the tensile strength is increased by 3.8% with 0.11% Zr and decreased by 5.0% with 0.46% Zr addition, while the elongation and yield strength are increased by 13.0% and 6.9% with 0.11% Zr and decreased by 9.6% and 7.3% with 0.46% Zr addition, respectively. © 2012. Source


Dai H.,Shandong University | Du J.,Shandong Jianzhu University | Wang L.,Shandong University | Peng C.,Shandong University | And 2 more authors.
Physica B: Condensed Matter | Year: 2010

AlP is heterogeneous nucleation substrate of primary Si in hypereutectic Al-Si alloys, while studies on the nucleation mechanism at atomic level are absent. The pseudopotential-based DFT calculations have been carried out to investigate the atomic and electronic structure, bonding and adhesion of the AlP/Si interface. In total, eight geometries have been investigated, in which the interfacial stacking sequence is different. The favorable interfaces can be deduced for the reason that adhesive interface energies (Wad) are different, which cannot be obtained from the traditional mismatch theory. The interfacial density of states and Mulliken population are also investigated. It is found that the main bond between AlP and Si is covalent Al-Si or P-Si bond, accompanying some ionic characteristic. © 2009 Elsevier B.V. All rights reserved. Source


Li Y.,Shandong University | Yang Y.,Shandong University | Wu Y.,Shandong University | Wei Z.,Shandong Binzhou Bohai Piston Co. | Liu X.,Shandong University
Materials Science and Engineering A | Year: 2011

The microstructure and elevated-temperature strength of an Al-Si piston alloy with 0.5wt.% Cr and 0.8wt.% Fe addition were investigated in this paper. The addition of Cr and Fe leads to the formation of α-Al(Fe,Cr)Si phase, which maintains the crystal structure of α-Al(Fe,Mn,Cr)Si phase but has different stoichiometry and morphology from the phase in previous works. Besides, the morphology of δ-Al3CuNi phase changes because of solid-solved Cr. These changes result in the formation of closed and semi-closed network eutectic colonies. The Cr-rich phases, acting as effective supportive strengthening phase, integrate organically with Ni-rich phases, acting as main strengthening phases. So α-Al phases are successfully encircled by eutectic intermetallic phases, and the slide of α-Al under stress at elevated temperature can be effectively hindered. Thus the ultimate tensile strength of the examined alloy is increased by 26% after 0.5wt.% Cr and 0.8wt.% Fe addition. © 2011 Elsevier B.V. Source

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