论文部分内容阅读
利用装有场发射电子枪的高分辩扫描电子显微镜 (FE- SEM)和透射电子显微镜 (TEM) ,研究了 Nd12 .6Fe余 Co17.4B7.0 Zr0 .1Ga0 .3 合金在 HDDR处理过程中氢化相变分解后的混合显微组织。发现其显微组织是一种在 α- (Fe,Co)基体上分布着纤维状的 Nd H2 和球状的 Nd H2 相构成的组织。纤维状 Nd H2相的体积百分比和 α- (Fe,Co)的尺寸随 (HD)处理温度的提高而增加。同时当氢化相变分解 (HD)温度升高时 ,(Fe,Co) 2 B相消失转而形成新相 (TE相 )。在 HDDR处理过程中氢化相变分解后添加一段 Ar气氛下的等温处理 (IA处理 )可使 HDDR粉末的磁各向异性得到改善 ,其显微组织中纤维状 Nd H2 相的体积百分数减少 ,而 α- (Fe,Co)晶粒尺寸增加 ,伴随着 (Fe,Co) 2 B消失。这些现象表明氢化相变分解后组织结构中 α- (Fe,Co)晶粒尺寸的增大有利于 HDDR粉末各向异性的提高
High-resolution scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) with a field-emission electron gun were used to study the hydrogenation phase transformation of Nd12.6Fe over Co17.4B7.0 Zr0.1Ga0.3 alloy during HDDR treatment Decomposed mixed microstructure. It is found that the microstructure is a kind of microstructure consisting of fibrous Nd 2 H 2 and spherical Nd 2 H 2 phases distributed on the α- (Fe, Co) matrix. The volume percent of fibrous Nd-H 2 phase and the size of α- (Fe, Co) increase with increasing HD treatment temperature. At the same time, the (Fe, Co) 2 B phase disappears to form a new phase (TE phase) when the temperature of hydrogenation decomposition decomposition (HD) increases. In the HDDR treatment, the magnetic anisotropy of the HDDR powder was improved by the isothermal treatment (IA treatment) after the hydrogen phase transformation and decomposition was added for a period of Ar atmosphere, and the volume fraction of the fibrous Nd and H2 phase in the microstructure decreased The grain size of α- (Fe, Co) increases with the disappearance of (Fe, Co) 2 B. These phenomena indicate that the increase of the size of α- (Fe, Co) grains in the structure of the structure after the hydrogenation phase transformation decomposition is in favor of the increase of the anisotropy of the HDDR powder