The formation of Nd₆Fe₁₃Ga phase promoted the continuity and non-ferromagnetism of grain boundary (GB) phases of Nd-Fe-Cu-Ga-B magnets during proper post-sintering annealing process. The coercivity increased dramatically with a decrease of remanence. After further annealing at the sintering temperature, the remanence recovered with a drop of coercivity. It indicated that Nd₂Fe₁₄B phase decomposed with the formation of Nd₆Fe₁₃Ga phase. Overextending the annealing time led to the gradual decrease of coercivity as the growth of Nd₆Fe₁₃Ga phase weakened the continuity of GB phases. Increasing the annealing temperature to the optimum temperature for Nd₆Fe₁₃Ga phase can aggravate the decrease of coercivity and remanence. Owing to the intensifying segregation of Ga and Fe in GB phases with the formation of Nd₆Fe₁₃Ga phase by dehydrogenation (HD) at 560 °C, high coercivity can be obtained by annealing at a lower temperature or for shorter time compared with HD at 480 °C. The enrichment of Cu in Nd-rich phase ensured its wettability and non-ferromagnetism when the diffusion of Fe and Ga became more local with the formation of Nd₆Fe₁₃Ga phase. Therefore, the combined effect of Cu doping and reasonable high temperature HD was conducive to obtain high coercivity in a larger range of annealing time and temperature for Nd-Fe-Ga-B magnet, which was a potential method for its mass production.

Nd ₆ Fe ₁₃ Ga相的形成促进了Nd-Fe-Cu-Ga-B磁体在适当的烧结后退火过程中晶界（GB）相的连续性和非铁磁性。随着剩磁的降低，矫顽力急剧增加。在烧结温度下进一步退火后，剩磁恢复，矫顽力下降。表明Nd ₂ Fe ₁₄ B相分解形成Nd ₆ Fe ₁₃ Ga相。随着 Nd ₆ Fe ₁₃的生长，过度延长退火时间导致矫顽力逐渐降低Ga相削弱了GB相的连续性。将退火温度提高到 Nd ₆ Fe ₁₃ Ga 相的最适温度会加剧矫顽力和剩磁的降低。由于GB相中Ga和Fe的偏析加剧，通过在560°C脱氢（HD）形成Nd ₆ Fe ₁₃ Ga相，与HD相比，通过在较低温度或较短时间退火可以获得高矫顽力在 480°C。当Fe和Ga的扩散随着Nd ₆ Fe ₁₃的形成变得更加局部时，富Nd相中Cu的富集确保了其润湿性和非铁磁性Ga相。因此，Cu掺杂和合理的高温HD的综合作用有利于Nd-Fe-Ga-B磁体在更大的退火时间和温度范围内获得高矫顽力，是其量产的潜在方法。