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Fabrication of AZ31/CNT Surface Nano-composite by Double-pass Friction Stir Processing

Kim J. Y., Hwang J.-W., Kim H. Y., Lee S. M., Jung W.-S., Byeon J.-W.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1039--1042

Double-pass Friction Stir Processing (FSP) was applied to fabricate an AZ31/CNT nano-composite for surface hardening of lightweight structural components. The effects of double-pass FSP as well as groove depth (i.e., volume fraction of CNT) on the CNT distribution, dynamically recrystallized grain size, and resulting microhardness were studied. Double-pass FSP was performed for the CNT-filled plate-type specimen with different groove depths of 2, 3, and 4 mm. By applying double-pass FSP, the average size of CNT clusters decreased, implying a more homogeneous distribution. Compared with the FSPed specimen without CNT, grain size was refined from 19 μm to 3 μm and microhardness increased from 52 Hv to 83 Hv (i.e., 71% increase).