Structural evolution of Fe-50 at.% Al powders during mechanical alloying and subsequent annealing processes
Structural evolution of Fe-50 at.% Al powders during mechanical alloying and subsequent annealing processes
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DOI：
10.1016/j.jallcom.2010.01.145
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发表时间：
2010-04-09
影响因子：
6.2
通讯作者：
Izadi, S.
中科院分区：
文献类型：
--
作者：
Haghighi, Sh. Ehtemam;Janghorban, K.;Izadi, S.
尽管铁铝化物具有优异的耐腐蚀性等理想性能，但其室温延展性和高温强度较低。机械合金化作为一种有能力合成纳米晶材料的工艺，正在考虑用来改善这些缺点。研究了机械合金化制备的铁铝化物粉的显微组织。在行星球磨机中球磨相同原子百分含量的Fe、Al元素粉末15min~100h，球磨80h的粉末在300℃、500℃和700℃下分别进行1h的热处理，合金粉末为无序的Fe(Al)固溶体，经退火后转变为FeAl金属间化合物。用X射线衍射仪研究了球磨时间和热处理对微晶尺寸、晶格参数和晶格应变等结构参数的影响。典型地，球磨80h的无序Fe(Al)固溶体的这些值分别为15 nm、2.92埃和3.1%，而在700℃下退火的FeAl金属间化合物的这些值分别为38.5 nm、2.896埃和1.2%。(C)2010爱思唯尔B.V.保留所有权利。
Iron aluminides, despite having desirable properties like excellent corrosion resistance, present low room-temperature ductility and low strength at high temperatures. Mechanical alloying as a capable process to synthesize nanocrystalline materials is under consideration to modify these drawbacks. In this study, the microstructure of iron aluminide powders synthesized by mechanical alloying and subsequent annealing was investigated. Elemental Fe and Al powders with the same atomic percent were milled in a planetary ball mill for 15 min to 100 h. The powder milled for 80 h was annealed at temperatures of 300, 500 and 700 degrees C for 1 h. The alloyed powders were disordered Fe(AI) solid solutions which were transformed to FeAl intermetallic after annealing. The effect of the milling time and annealing treatment on structural parameters, such as crystallite size, lattice parameter and lattice strain was evaluated by X-ray diffraction. Typically, these values were 15 nm, 2.92 angstrom and 3.1% for the disordered Fe(AI) solid solution milled for 80 h and were 38.5 nm, 2.896 angstrom and 1.2% for the FeAl intermetallic annealed at 700 degrees C, respectively. (C) 2010 Elsevier B.V. All rights reserved.