The as-solution-treated Sm₂Co₁₇-type magnets exhibiting a single 1:7H phase with different average grain sizes (D) were designed. Anisotropy of bending strength (R_bb) and compressive strength (R_mc) of the magnets were investigated. Moreover, the R_bb increases from 86 to 173 MPa with D decreasing from ∼52 to ∼18 μm for group c//h samples. The Hall–Petch correlation was employed to reveal the effect of grain size on mechanical properties of the magnets, giving deep understanding of the mechanical anisotropy characteristics. The relatively high Hall–Petch coefficient K^Rbb (0.79 MPa⋅m^1/2) gives rise to the largest R_bb (173 MPa) for group c//h samples. The mechanical anisotropy of the samples is well explained based on crystal structure and grain size features (grain boundaries). Grain refinement is an effective way to enhance the mechanical properties of Sm₂Co₁₇-type sintered magnets.

设计了具有不同平均晶粒尺寸( D ) 的单一1:7H 相的固溶处理Sm ₂ Co ₁₇型磁体。研究了磁体的弯曲强度( R _bb )和抗压强度( R _{mc )的各向异性。}此外，对于c // h组样品， R _bb从 86 增加到 173 MPa，而D从 ~52 减少到 ~18 μm 。Hall-Petch 相关性用于揭示晶粒尺寸对磁体机械性能的影响，从而深入了解机械各向异性特性。相对较高的 Hall-Petch 系数K ^{R bb} (0.79 MPa⋅m ^1/2 ) 产生了c // h组样本的最大R _bb (173 MPa) 。基于晶体结构和晶粒尺寸特征（晶界）很好地解释了样品的机械各向异性。晶粒细化是提高Sm ₂ Co ₁₇型烧结磁体力学性能的有效途径。