Skip to main content Accessibility help
×
Home
Hostname: page-component-544b6db54f-n9d2k Total loading time: 0.16 Render date: 2021-10-21T16:17:02.045Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys

Published online by Cambridge University Press:  22 February 2011

A. Stergiou
Affiliation:
Department of Materials Science and Engineering, University of Surrey Guildford GU2 5XH, UK
P. Tsakiropoulos
Affiliation:
Department of Materials Science and Engineering, University of Surrey Guildford GU2 5XH, UK
Get access

Abstract

Solidification microstructures and phase selection in ingots and melt-spun ribbons of MoSi2, MoSi2-W-Ta and MoSi2-Al alloys were studied. Rapid quenching from the melt refined the grain size of all alloys by two orders of magnitude compared to the ingots. Zone A microstructures were formed in the wheel side of all alloy ribbons. Addition of W and Ta and of Al suppressed the formation of Mo5Si3 in the ingots and ribbons. Tungsten exhibited complete solid solubility in MoSi2. In the ribbons the solubility of Ta in MoSi2 was extended to 2 at% in Zone A, and in the ingots and zone B of the ribbons hexagonal (C40) TaSi2 and tetragonal (C11b) MoSi2 structures were formed. A fine lamellar microstructure between the Cllb and C40 phases was formed at 1350°C after 48h. Addition of Al changed dramatically the solidification microstructure which consisted of two phases C40 Mo(Al0.5Si0.5)2 and C54 MoAl1.3Si0.7. In the ingots the room temperature hardness decreased with addition of W and Ta and of Al. Addition of Al increased the thermal stability of the MoSi2-Al alloy.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Kieffer, R. et. al., Monatshefte fur Chemie V93, 517 (1962).CrossRefGoogle Scholar
2. Boettinger, W.J. et. al., Mater. Sci. Eng., A155, 33 (1992).CrossRefGoogle Scholar
3. Brukl, C. et. al., Monatshefte fur Chemie V92, 967 (1961).CrossRefGoogle Scholar
4. Shah, D.M. et. al., Mater. Sci. Eng., A155, 45 (1992).CrossRefGoogle Scholar
5. Maloy, S. et. al., J. Am. Ceram Soc., 74, 2704 (1991).CrossRefGoogle Scholar
6. Silva, A. Costa e and Kaufman, M.J., Scripta Metall. Mater., 29, 1141 (1993).CrossRefGoogle Scholar
7. Umakoshi, Y. et. al., Scripta Metall., 23, 87 (1989).CrossRefGoogle Scholar

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *