Controlled Thermal Expansion Alloys Project

Metadata Updated: July 8, 2015

[HTML_REMOVED]p[HTML_REMOVED][HTML_REMOVED]strong[HTML_REMOVED]This first part of this effort [HTML_REMOVED]/strong[HTML_REMOVED]investigated the iron-nickel binary system with varying nickel content over a range of CTE from 0.6ppm/[HTML_REMOVED]deg;C to 10.0ppm/[HTML_REMOVED]deg;C.[HTML_REMOVED]nbsp; Figure 1 shows a comparison of calculated values of room temperature CTE for binary Fe-f(Ni) alloys based on the two gamma state ferromagnetic model for the face-centered cubic Fe-Ni austenite matrix, with one-hundred year old data from the experimental work of Guillaume.[HTML_REMOVED]nbsp; Both the calculation and the early experimental data indicate that the CTE of Fe-Ni binary alloys vary continuously with nickel content in a smooth and predictable manner.[HTML_REMOVED]/p[HTML_REMOVED][HTML_REMOVED]p[HTML_REMOVED][HTML_REMOVED]strong[HTML_REMOVED]The second part of this [HTML_REMOVED]/strong[HTML_REMOVED][HTML_REMOVED]strong[HTML_REMOVED]effort[HTML_REMOVED]/strong[HTML_REMOVED] determined experimentally the functional relationship between Ni content and CTE for the binary Fe-Ni system.[HTML_REMOVED]nbsp; This was achieved by manufacturing a series of test alloys using high-precision melt metallurgical techniques.[HTML_REMOVED]nbsp; The test alloys were heat treated by the Goddard Space Flight Center[HTML_REMOVED]rsquo;s (GSFC) Materials Engineering Branch (MEB) and CTE coupons were machined by GSFC[HTML_REMOVED]rsquo;s Advanced Manufacturing Branch.[HTML_REMOVED]nbsp; Microstrain was measured as a function of temperature from 300K to 23K using the MEB interferometer.[HTML_REMOVED]nbsp; Figure 2 shows an example of a secant CTE calculated from these microstrain measurements over the temperature range 10[HTML_REMOVED]deg;C to 30[HTML_REMOVED]deg;C.[HTML_REMOVED]/p[HTML_REMOVED]

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date April 9, 2015
Metadata Updated Date July 8, 2015

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date April 9, 2015
Metadata Updated Date July 8, 2015
Publisher N/A
Unique Identifier TECHPORT_10720
Michael Johnson
Maintainer Email
Id {$oid: 55942a86c63a7fe59b498067}
Public Access Level public
Bureau Code 026:00
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id 88e53079-a12d-486a-8fbd-9630109a56a6
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2011-10-01T00:00:00Z
Homepage URL
Language en-US
Data Last Modified 2015-03-12
Program Code 026:000
Publisher Hierarchy National Aeronautics and Space Administration > N/A
Related Documents,,,,,,,
Source Datajson Identifier True
Source Hash fa4a007e11c51c13c23c8a4319cf0be53c5c3e89
Source Schema Version 1.1
Temporal 2011-10-01T00:00:00Z/2014-09-01T00:00:00Z

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