A study of B2[leftrightarrow]B19[leftrightarrow]B19[prime] two-stage martensitic transformation in a Ti[sub 50]Ni[sub 40]Cu[sub 10] alloy

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90007-F· OSTI ID:6052650

Lo, Y C; Wu, S K ^[1]; Horng, H E ^[2]

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1. National Taiwan Univ., Taipei, (Taiwan, Province of China). Institute of Materials Science and Engineering
2. National Taiwan Normal Univ., Taipei, (Taiwan, Province of China). Dept. of Physics

The B2[leftrightarrow]B19[leftrightarrow]B19[prime] two-stage martensitic transformation in a Ti[sub 50]Ni[sub 40]Cu[sub 10] alloy has been investigated by electrical resistivity, DSC, X-ray diffraction and internal friction measurements. The shear modulus of B19 martensite has an unusually low value over a broad temperature range between the two shear modulus minima. The B2[leftrightarrow] B19 transformation is thus proposed to proceed under the condition of deep shear modulus softening. X-ray diffraction results show that the B19[leftrightarrow]B19[prime] is an incomplete transformation and that the monoclinic angle [beta] of B19[prime] martensite will increase with decreasing temperature. This indicates that the B19[leftrightarrow]B19[prime] transformation has the characteristic of the continuously monoclinic distortion of B19[prime] martensite, which is similar to that of the continuously rhombohedral distortion of R-phase. The opposite behavior observed in electrical resistivity and DSC measurements for B2[leftrightarrow]B19 and B19[leftrightarrow]B19[prime] transformations is also discussed.

• OSTI ID: 6052650
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:3; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
CARBON ADDITIONS
COHERENT SCATTERING
COPPER ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FRICTION
IRON ALLOYS
MARTENSITE
NICKEL ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
TERNARY ALLOY SYSTEMS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
X-RAY DIFFRACTION