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Shape strains associated with thermally-induced and stress-induced martensite in a CuAlNi shape memory alloy

Journal Article


Abstract


  • Accurate measurements have been made of the shape strain accompanying the formation of the 2H orthorhombic γ′1 martensite during cooling and during compressive stressing of a Cu14%Al3.4%Ni shape memory alloy. In both transformations the displacement vectors have magnitude 0.087 and are near [1̄10]B in the [010]B-[1̄10]B-[1̄11]B stereographic triangle, the habit planes are near (3̄3̄1)B on both sides of the (1̄10)B symmetry plane and the dilatation parameter is unity. Crystallographic analysis using the geometrical theory indicates that the two shape strains, associated with the two kinds of habit plane, are approximately consistent with two different {121}o twinning heterogeneities in the martensite. However, the discrepancies between the measurements and the theoretical calculations are sufficiently large to suggest that the complementary strain is more complex than a simple shear on the martensite twinning elements. © 1982.

Publication Date


  • 1982

Citation


  • Kennon, N. F., & Dunne, D. P. (1982). Shape strains associated with thermally-induced and stress-induced martensite in a CuAlNi shape memory alloy. Acta Metallurgica, 30(2), 429-435. doi:10.1016/0001-6160(82)90223-1

Scopus Eid


  • 2-s2.0-0020090801

Web Of Science Accession Number


Start Page


  • 429

End Page


  • 435

Volume


  • 30

Issue


  • 2

Abstract


  • Accurate measurements have been made of the shape strain accompanying the formation of the 2H orthorhombic γ′1 martensite during cooling and during compressive stressing of a Cu14%Al3.4%Ni shape memory alloy. In both transformations the displacement vectors have magnitude 0.087 and are near [1̄10]B in the [010]B-[1̄10]B-[1̄11]B stereographic triangle, the habit planes are near (3̄3̄1)B on both sides of the (1̄10)B symmetry plane and the dilatation parameter is unity. Crystallographic analysis using the geometrical theory indicates that the two shape strains, associated with the two kinds of habit plane, are approximately consistent with two different {121}o twinning heterogeneities in the martensite. However, the discrepancies between the measurements and the theoretical calculations are sufficiently large to suggest that the complementary strain is more complex than a simple shear on the martensite twinning elements. © 1982.

Publication Date


  • 1982

Citation


  • Kennon, N. F., & Dunne, D. P. (1982). Shape strains associated with thermally-induced and stress-induced martensite in a CuAlNi shape memory alloy. Acta Metallurgica, 30(2), 429-435. doi:10.1016/0001-6160(82)90223-1

Scopus Eid


  • 2-s2.0-0020090801

Web Of Science Accession Number


Start Page


  • 429

End Page


  • 435

Volume


  • 30

Issue


  • 2