Effect of Hot Pressing on Microstructure and Mechanical Properties of Bulk Nanocrystalline Fe_3Al Materials Containing Manganese Element  

作　　者：LI Yu-feng LA Pei-qing WEI Yu-peng LU Yang YANG Yang 

机构地区：[1]State Key Laboratory of Gansu Advanced Nonferrous Materials,Lanzhou University of Technology,Lanzhou 730050,Gansu,China

出　　处：《Journal of Iron and Steel Research International》2011年第3期65-71,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(50674051)

摘　　要：Bulk nanocrystalline Fe3Al materials containing manganese of 10% were prepared by aluminothermic reaction.Hot pressing of those materials was performed at different temperatures and times.The microstructures of the alloy were investigated by optical microscope（OM） and electron probe microanalyzer（EPMA）.The grain sizes of the materials were analyzed by X-ray diffraction（XRD） and transmission electron microscope（TEM）.The results showed that the grain sizes of the materials increase after hot pressing.The grain sizes of the materials decrease with increasing the hot pressing times at the same temperature and the grain sizes of the materials increase with increasing hot pressing temperatures at identical times.The hardness and compressibility of the materials were also tested.The results showed that the hardness decreases with increasing hot pressing times at 800 ℃ and hardness increases with increasing the hot pressing temperatures.The variation of hardness with grain size of the nanocrystalline Fe3Al materials after hot pressing is contrary to the Hall-Petch relation.The materials are not broken during hot pressing and exhibit good plasticity and compressibility.Bulk nanocrystalline Fe3Al materials containing manganese of 10% were prepared by aluminothermic reaction.Hot pressing of those materials was performed at different temperatures and times.The microstructures of the alloy were investigated by optical microscope（OM） and electron probe microanalyzer（EPMA）.The grain sizes of the materials were analyzed by X-ray diffraction（XRD） and transmission electron microscope（TEM）.The results showed that the grain sizes of the materials increase after hot pressing.The grain sizes of the materials decrease with increasing the hot pressing times at the same temperature and the grain sizes of the materials increase with increasing hot pressing temperatures at identical times.The hardness and compressibility of the materials were also tested.The results showed that the hardness decreases with increasing hot pressing times at 800 ℃ and hardness increases with increasing the hot pressing temperatures.The variation of hardness with grain size of the nanocrystalline Fe3Al materials after hot pressing is contrary to the Hall-Petch relation.The materials are not broken during hot pressing and exhibit good plasticity and compressibility.

关 键 词：hot pressing Fe3Al nanostructure material microstructure mechanical property 

分 类 号：TB383[一般工业技术—材料科学与工程] S153.61[农业科学—土壤学]