2018. EFFECT OF ADDING BORON CARBIDE (B4C) TO POLYMER FOR PRODUCING SURFACE COMPOSITE BY FRICTION STIR PROCESSING. THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING. 18, 3 (Nov. 2018), 436–445. DOI:https://doi.org/10.32852/iqjfmme.v18i3.178.