Abstract
The Fe61Co7Zr9.5Mo5W2B15.5 bulk metallic glass (BMG) has the best glass forming-ability (GFA), highthermal stability, and the highest strength (the compressive strengthσ = 3800 MPa) among known Fe-based alloys. Unfortunately, this BMG does not have the samegood soft magnetic properties as other Fe-based BMGs do. We report here that a smallamount of Ni addition (microalloying) can significantly enhance the soft magneticproperties of the alloy without deteriorating its high GFA. The saturation magnetization isincreased threefold, while the coercivity is decreased about 40-fold, with only 3 at.% Niaddition. The improvement is interpreted to result from the enhancement of the magneticexchange interaction as the Ni content increases. The results indicate that it is possible toadjust the magnetic properties of Fe-based BMGs by a minor change in the content ofsome component. BMGs with good soft magnetic property, ultrahigh mechanicalstrength, good GFA and high thermal stability show some promise for futureapplications.
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