Method of preparing a two-way shape memory alloy

Patent · Tue Mar 06 00:00:00 EST 1984

OSTI ID:7007585

Johnson, A D

A two-way shape memory alloy, a method of training a shape memory alloy, and a heat engine employing the two-way shape memory alloy to do external work during both heating and cooling phases are disclosed. The alloy is heated under a first training stress to a temperature which is above the upper operating temperature of the alloy, then cooled to a cold temperature below the zero-force transition temperature of the alloy, then deformed while applying a second training stress which is greater in magnitude than the stress at which the alloy is to be operated, then heated back to the hot temperature, changing from the second training stress back to the first training stress. 8 figs.

• DOE Contract Number: W-7405-ENG-48
• Assignee: PTO; EDB-94-123887
• Patent Number(s): US 4435229; A
• Application Number: PPN: US 6-308127
• OSTI ID: 7007585
• Resource Relation: Patent File Date: 2 Oct 1981
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
FABRICATION
SHAPE MEMORY EFFECT
HEAT ENGINES
TEMPERATURE DEPENDENCE
ENGINES
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies