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ASM Handbook

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials

By
ASM Handbook Committee
ASM Handbook Committee
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ASM International
Volume
2
ISBN electronic:
978-1-62708-162-7
Publication date:
1990
Book Chapter

Low-Expansion Alloys

By
Earl L. Frantz
Earl L. Frantz
Revising author
Carpenter Technology Corporation
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Published:
1990
Page range:
889 - 896

Abstract

Low-expansion alloys are various binary iron-nickel alloys and several ternary alloys of iron combined with nickel-chromium, nickel-cobalt or cobalt-chromium alloying and are used in applications such as geodetic tape, bimetal strip, glass-to-metal seals, and electronic and radio components. This Article focuses on the properties, composition, and applications of various low-expansion alloys, including iron-nickel alloys (Invar), iron-nickel-chromium alloys (Elinvar), iron-nickel-cobalt alloys (Super-lnvar, Kovar) and iron-cobalt-chromium alloys (special alloys). It further discusses the effect of factors like composition, heat treatment, cold drawing, and humidity on the coefficient of thermal expansion of various low-expansion alloys. The Article provides information on the machining parameters and the physical and mechanical properties of low-expansion alloys. It also provides an outline of special low-expansion alloys, namely, iron-cobalt-chromium alloys, hardenable alloys, and high-strength controlled-expansion alloys.

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Earl L. Frantz, 1990. "Low-Expansion Alloys", Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook Committee

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