Synthesis of Fe–Cr–Mo–C–B–P bulk metallic glasses with high corrosion resistance.pdfVIP

Acta Materialia 50 (2002) 489–497 /locate/actamat Synthesis of Fe–Cr–Mo–C–B–P bulk metallic glasses with high corrosion resistance S.J. Pang *, T. Zhang, K. Asami, A. Inoue Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan Received 13 August 2001; received in revised form 1 October 2001; accepted 3 October 2001 Abstract Bulk metallic glasses with a maximum thickness (tmax) of 1.0–2.7 mm were synthesized in the Fe43Cr16Mo16(C, B, P)25 system over a wide composition range by copper mold casting. They exhibit a large supercooled liquid region (T ) of 40–90 K and a high reduced glass transition temperature (T /T ) of 0.54–0.60, indicating high glass-forming x g l ability (GFA) and high thermal stability of the supercooled liquid. The critical cooling rate for glass formation was evaluated to be of the order of 102 K s1. The bulk metallic glasses exhibited high corrosion resistance in aggressive HCl solutions. The alloying element P has a beneficial effect on corrosion resistance.  2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved. Keywords: Metallic glasses; Iron alloys; Rapid solidification; Corrosion 1. Introduction Among the bulk metallic glass formers, Fe-based alloy systems have attracted great attention Since the synthesis of bulk glassy alloys in Mg- because of their commercial importance. Fe-based [1], Ln- [2] and Zr