纳米晶材料作为新型结构材料和功能材料的应用 ,在颇大程度上取决于粉末固结成大块纳米晶固体的过程。在固结过程中形成的亚稳显微组织 ,对于所得材料的力学性能、磁性能或催化性能起着重大影响。研究了纳米晶γ 镍铁粉末的无压烧结行为 ,该镍铁粉末是由球磨后进行氢气还原制得 The use of nanocrystalline materials as novel structural and functional materials depends to a large extent on the process of powder consolidation into bulk nanocrystalline solids. Metastable microstructures formed during the consolidation process have a significant effect on the mechanical, magnetic or catalytic properties of the resulting material. The pressureless sintering behavior of nanocrystalline γ-Fe-Ni powders was studied, and the Fe-Ni powders were obtained by ball milling and hydrogen reduction