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The low coercivity in MnAl alloys has become a barrier to develop high performance MnAl‐based magnets for more than five decades. Herein, a high room‐temperature coercivity of 0.59 T in MnAl disc is achieved by severe plastic deformation. The grain size of the MnAl decreases significantly when ε‐phase is transformed into τ‐phase and when the τ‐phase is severely deformed. The aging process enhances...
Ping‐Zhan Si et al. (article number 1900356) have prepared bulk MnAl nanocrystalline alloy with a highest room‐temperature coercivity up to 0.59 T by using a high‐pressure torsion process. The severe plastic deformation process decreased the grain size of τ‐phase MnAl significantly. As a result, the coercivity of the MnAl was enhanced remarkably. This work opens a window for the development of bulk...
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