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The Effect of Additive Element on the Properties of Mechanically Alloyed Fe-Y2O3 Alloys

Ahn J.-H., Kim T. K., Ahn J.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1043--1046

In the present work, we have examined the effect of Ti on the properties of Fe-Y2O3 alloys. The result showed that the addition of Ti was effective for improving mechanical properties. This is due to the reduction of oxides by Ti during mechanical alloying and hot-consolidation. In particular, iron oxides are effectively reduced by the addition of Ti. Compared to the pristine Fe-Y2O3 alloys, titanium-added alloys exhibited fine and uniform microstructures, resulting in at least 60% higher tensile strength.

Properties Of MgB2/Ga Composites Prepared By Mechanical Alloying

Yoon K., Ahn J.-H.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1271--1274

In this study, we examined the effect of Ga-doping and mechanical alloying in MgB2 on microstructural and phase evolution. A comparison was made between in-situ and ex-situ processed Mg-B-Ga samples. Densification was markedly improved by ex-situ sintering of ball-milled MgB2+Ga. The Ga-doping and ball-milling prior to sintering resulted in the formation of impurity phases such as MgO, Ga5Mg2 and Ga2O3. Lattice parameter of MgB2 increased with increasing ball-milling duration as well as by Ga-doping.