Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 12    No. 5    October 2002

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Fracture behavior of B2-ordered iron
aluminide with Mn addition
LOU Bai-yang(楼白杨), YANG Ji-long(杨继隆),
LU Chong-da(鲁聪达), Jin Jie(金   杰)

College of Mechanical Engineering,Zhejiang University of Technology,
Hangzhou 310014, China

Abstract:The microstructure and fracture behavior of B2-ordered iron aluminides with and without Mn (1.5%, mole fraction) were investigated by tensile tests (TT) and scanning electron microscope (SEM). The results show that the addition of Mn into the alloy can improve tensile properties and plasticity of the alloy and change the fracture behavior of the alloy from transgranular cleavage into intergranular mixed with transgranular cleavage. The theoretical calculation, by computer, indicates that the B2-ordered Fe-28Al alloy cleaves on {100} planes because of weak bond strength. Addition of Mn into the alloy, whose atoms likely occupy sites I in the unit cell, can increase the cleavage strength of the alloy on {100}, leading to higher fracture strength and plasticity of the alloy after Mn addition.


Key words:  fracture; cleavage strength; iron aluminide

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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