A SHORT REVIEW OF PUBLISHED INFORMATION ON THE THERMAL EXPANSION OF ALLOYS IN THE IRON-NICKEL AND IRON-NICKEL-COBALT SYSTEMS

Technical Report · Mon Jan 14 04:00:00 EST 1952

OSTI ID:4212063

Smith, E S

For both these series of alloys the characteristic thermal-expansion curve shows a fairly rapid expansion at low temperature, followed by a temperature interval where the coefficient of expansion is at a minimum, after which at the inaection temperature there is a rapid increase in the rate of expansion. These three stages become less marked as the inflection temperature increases. As the nickel content is increased in the iron-nickel series of alloys, the inflection temperature rises from 155 C at 30% Ni to 590 C at 55% Ni when it becomes indistinct. At the same time the minimum coefficient of expansion decreases reaching a minimum at 36% Ni (1 to 2 x 10/sup -6/ C) after which it again increases reaching a value of 9.6 x 10/sup -6/// C at 50% Ni. The addition of cobalt to the iron--nickel alloys raises the inflection temperature as does nickel, without at the same time increasing the minimum coefficient of expansion to the same extent. Consequently, for a given inflection temperature the iron--nickel--cobalt alloy will have a lower minimum coefficient of expansion than the corresponding iron --nickel alloy. (auth)

• Research Organization: Gt. Brit. Div. of Atomic Energy (Production), Risley, Lancs, England
• NSA Number: NSA-13-019251
• OSTI ID: 4212063
• Report Number(s): RDB(R)/TN-2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COBALT ALLOYS
EXPANSION
IRON ALLOYS
MEASURED VALUES
METALLURGY AND CERAMICS
NICKEL
NICKEL ALLOYS
QUANTITY RATIO
TEMPERATURE
VELOCITY