Martensitic transition in a Ni40Ti50Cu10 alloy containing hydrogen : Calorimetric (DSC) and mechanical spectroscopy experiments

• Published in: Scripta materialia Vol. 44; no. 5; pp. 719 - 724
• Main Authors: ROTINI, A, BISCARINI, A, CAMPANELLA, R, COLUZZI, B, MAZZOLAI, G, MAZZOLAI, F. M
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Science 26.03.2001
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Martensitic transformations; Materials science; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Quaternary alloys; Temperature dependence; Titanium alloys; Nickel alloys; Phase transformations; DSC; Copper alloys; Martensitic transformations; Experimental study; Acoustic method
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/s1359-6462(00)00672-2

Ternary Ni(50-x)Ti50Cu(x) alloys have been extensively investigated, and their martensitic transformation behaviors as well as their shape memory properties are well known. In particular, it has been established that, for x = 7.5-15, the solution treated and quenched alloys undergo the reversible transformation B2-B19 (orthorhombic)-B19'. After heavy cold-working, followed by low temperature anneals (below 723 K) and quenching, alloys with a Cu content near 9 percent undergo only the B2-B19 transition. Since the B19 orthorhombic martensite has a simpler microstructure than the B19' martensite, it was of interest to study the effect of H additions on the temperature dependence of internal friction and Young's modulus in an alloy undergoing only the B2-B19 transition. Here, results of differential scanning calorimetry and mechanical spectroscopy are presented for specimens of the ternary shape memory alloy Ni40Ti50Cu10. (CSA)