Abstract: Metallographic microanalysis, room temperature mechanical properties and hardness tests were carried out on as-hot-forged aluminum-bronze QAl10-4-4 after different solid solution and aging temperatures. The results show that the optimized solid solution temperature of the aluminum-bronze is 850 ℃, thus, a small amount of β′ phase is precipitated on the basis of α-phase and k-phase which result in the alloy obtain higher strength and hardness. On the solution treatment basis, after aging at 650 ℃ for 2 h, the tensile strength of the alloy is 726 MPa, the yield strength is 491 MPa, the hardness is 209 HBW, and the elongation is 22.7% due to the interaction between the tiny granule k phase precipitated from β′ martensite decompose and the finer α phase. Compared with the original untreated brone, the microstructure and properties of the aluminum brone are obviously improved and the alloy achieves good combination of strength and toughness.

Key words: aluminum bronze, solution, aging, microstructure, mechanical properties