A study on the susceptibility of various iron-cobalt-boron-silicon metallic glasses to stress- corrosion cracking has been conducted. Testing was carried out on thin metallic ribbons of Fe78B13Si9, Fe66Co18B15Si1, Co66Fe4Ni1B14Si15, Co76Fe2Mn4B12Si6, and Co69Fe4Ni1Mo2B12 Si12 in 0%, 25%, 50%, 75%, and 100% Hydrochloric acid solutions at room temperature. The tests were performed under constant-strain conditions in the various solutions until complete separation of the ribbons occurred. Typical fractographic techniques were used for analyzing the failure of the glasses. The results indicated that the susceptibility of the glasses Fe78B13Si9, Fe66Co18B15Si1, Co76Fe2Mn4B12Si6 and samples of Co66Fe4 Ni B14Si15 glass to stress-corrosion cracking varies only as a function of the amplitude of the strain. Susceptibility is independent of the solution concentration. It is found that the additions of Ni, Mn, Mo and high content of Co into the Fe-Co-B-Si glass enhance the resistance of the alloy against stress-corrosion cracking in HCl solution. On contrary, the results showed that Co69Fe4Ni1Mo2B12Si12 glass is not susceptible to stress-corrosion cracking in HCl solutions.

Subject
Ribbons, Thin films, Corrosion failures, Materials, Glass, Nickel based alloys, Permeability, Tubes, Fracture surfaces, Transformers, Stress, Mechanical failure, Stress corrosion cracking
© 1994 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1994
Association for Materials Protection and Performance (AMPP)
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