Abstract:
With copper powder, aluminum powder, nickel powder and copper-coated iron powder as raw materials, Cu-10Al-4Ni alloys containing different mass fractions (0, 1.6%, 3.2%, 4.8%, 6.4%) of iron were prepared by powder metallurgy process. The effect of iron content on the microstructure and properties of the alloy was studied. The results show that the microstructure of the alloy without iron addition consisted of Κ
Ⅲ phase, α phase and Al
4Cu
9 phase. When the mass fraction of iron was 1.6%, the Κ
Ⅲ phase increased and Al
4Cu
9 phase decreased in the alloy. When the mass fraction of iron was 3.2%, Al
4Cu
9 phase further decreased, and Κ
Ⅰ and Κ
Ⅱ phases were precipitated in the alloy. When the iron content continued to increase, the Al
4Cu
9 phase disappeared, Κ
Ⅰ phase increased while Κ
Ⅲ phase decreased. With increasing iron content, the sintered density of the alloy decreased, the hardness decreased first then increased and then decreased, and reached the maximum with iron mass fraction of 3.2%. The yield strength of the alloy fluctuated with increasing iron content, and reached the maximum when the mass fraction of iron was 4.8%.