Abstract Varying degrees of strain were observed in L10-Mn56Ga42 powders via low-energy mechanical cryomilling, and the relationship between coercivity and strain was analyzed in detail. With increasing milling time, the powders do not show obvious variations in grain size and cell parameters, but a large strain is induced into the powders, leading to a remarkable enhancement in coercivity. A maximum coercivity of up to 6.7 kOe was accomplished for 20 h milled powders, with a high residual strain of about 0.96%. The initial magnetization curve indicates that the coercivity mechanism is mainly governed by the domain-wall pinning process where strain-induced defects act as pinning centers. Studies on heat treatments show that the strain-induced coercivity contributes to over 50% of the total coercivity, and a moderate annealing can eliminate the strain, changing the coercivity mechanism to a nucleation process.

中文翻译：

---

通过低能机械低温铣削了解应变对 L1-Mn56Ga42 合金矫顽力增强的影响

摘要 通过低能机械低温研磨观察到L10-Mn56Ga42粉体发生不同程度的应变，并详细分析了矫顽力与应变之间的关系。随着研磨时间的增加，粉末的晶粒尺寸和晶胞参数没有表现出明显的变化，但在粉末中产生了很大的应变，导致矫顽力显着增强。研磨 20 小时后的最大矫顽力高达 6.7 kOe，残余应变约为 0.96%。初始磁化曲线表明矫顽力机制主要受畴壁钉扎过程控制，其中应变引起的缺陷充当钉扎中心。热处理研究表明，应变诱导的矫顽力占总矫顽力的 50% 以上，