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We have studied the composition dependence, thermal stability, long-term stability at 500Â°C, and magnetic properties of the nanostructural TbCu7-type (1:7) Sm-Co-Ti alloys. We prepared the SmCox-0.4Ti0.4 alloys with a wide composition range from x = 5.0 to x = 8.5 by high-energy ball-milling, followed by annealing at 700-1100Â°C for 2 h. After annealing at 700Â°C, the powders with x = 7.0-8.5 showed a single 1:7 structure, while the powders with x = 5.0-6.5 presented the 1:7 plus CaCu5-type (1:5) structure. At an annealing temperature higher than 800Â°C, a minor Th2Zn17-type (2:17) phase precipitated in the matrix of the 1:7 phase. Intrinsic coercivity iHc exhibits a maximum of 2.3 T at room temperature and 0.4 T at 500Â°C in the x = 7.0 samples annealed at 700Â°C. The temperature coefficient of iHc seems stable as the Sm/Co ratio changes from 1/6.5 to 1/7.5. The coercivity decreased with increasing annealing temperature Ta, from 2.3 T at Ta = 700Â°C to 1.3 T at Ta = 1100Â°C, which is mainly attributed to the grain growth from 35 nm for Ta = 700Â°C to 1 Â¿m for Ta = 1100Â°C. After holding at 500Â°C for up to 360 h, the microstructure and magnetic properties of the 1:7-type nanograin alloys remained almost unchanged, indicating a structurally and magnetically long-term stabilization at the potential high-temperature application environment.