In this study, formation of Ni-rich phases in Al-12 wt.%Si-4 wt.%Cu-1.2 wt.%Mn-xwt.%Ni (x = 0.8, 2.0, 2.4, 3.4) alloys and their effect on high temperature strength were investigated by microstructure characterization and tensile test. Three types of Ni-rich phases are observed: δ-Al3CuNi, γ-Al7Cu4Ni and ε-Al3Ni. The amount of Ni-rich phases is increased with Ni content in the alloy. Ni-rich phases in Ni1-Ni2 alloys (x = 0.8 and 2.0, respectively) are in the form of δ-Al3CuNi and γ-Al7Cu4Ni, and however, a great amount of rod-like or needle-like ε-Al3Ni phase is observed in Ni3-Ni4 alloy (x = 2.4 and 3.4, respectively). Microstructure observation of the samples after solutionizing at 510 °C for 5 h indicates that these Ni-rich phases have good thermal stability. Ni-alloying in Al-12 wt.%Si-4 wt.%Cu-1.2 wt.%Mn alloy decreases the strength at room temperature, but proper addition of Ni can remarkably improve the strength at 350 °C and considerably and efficiently slow down the softening effect of material at high temperature stage. 0.8 wt.% Ni addition results in a considerable increase in UTS at 350 °C from 65 MPa (without Ni addition) to 97 MPa. During tensile test at room temperature, both Mn-rich phase dendrites and Ni-rich compounds are the crack originating sites of cleavage fracture. However, during tensile test at 350 °C, the Mn-rich dendrites are the sites for fracture, but Ni-rich compounds are not.
heat-resistant aluminum alloy high temperature strength microstructure nickel-rich phase
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This work is supported by Jiangsu Key Laboratory of Advanced Metallic Materials (Grant Number BM2007204) and the Fundamental Research Funds for the Central Universities (Grant Number 2242016K40011).
Data Availability Statement
No additional data are available.
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