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Influence of Ultrasonic Melt Treatment on Ni‐Containing Intermetallic Phases in Al–Si Piston Alloys
Author(s) -
Dong Xiongbo,
Guo Yongchun,
Li Jianping,
Wang Jianli,
Xia Feng,
Ma Zhijun,
Yang Wei,
Bai Yaping,
Liang Minxian
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901590
Subject(s) - intermetallic , materials science , alloy , ultrasonic sensor , morphology (biology) , ultimate tensile strength , piston (optics) , elongation , metallurgy , phase (matter) , mischmetal , composite material , chemistry , physics , organic chemistry , wavefront , biology , acoustics , optics , genetics , hydrogen storage
The influence of ultrasonic melt treatment (USMT) at different ultrasonic powers (0, 900, 2400, and 3000 W) on the morphology and chemical composition of Ni‐containing intermetallic phases (T‐Al 9 FeNi and δ‐Al 3 CuNi phases) in an Al‐11.5Si‐4Cu‐2Ni‐1Mg‐0.45Fe (wt%) piston alloy is investigated. The morphological characterization reveals that the USMT not only decrease the size of the T‐Al 9 FeNi and δ‐Al 3 CuNi phases but also change the morphology of T‐Al 9 FeNi from skeleton‐ to block‐shaped. The block‐shaped T‐Al 9 FeNi contributes the most to the high‐temperature properties because this morphology is beneficial in the formation of semi‐continuous network structures. The chemical composition of T and δ phases is analyzed. The Cu → Fe in the T phase and Ni ↔ Cu in the δ phase existing in the examined alloys are estimated. With increasing the ultrasonic power from 0 to 3000 W, the ultimate tensile strength, yield strength, and elongation are increased from 98.46 to 124.57 MPa, 82.4 to 101.87 MPa, and 2.95% to 5.12%, respectively, at 350 °C.