On the transformation path of reverse thermoelastic martensitic transformation

• Published in: Scripta metallurgica et materialia Vol. 33; no. 3; pp. 433 - 439
• Main Authors: Sittner, Petr, Hara, Yasuhiro, Tokuda, Masataka
• Format: Journal Article
• Language: English
• Published: Seoul Elsevier B.V 01-08-1995; Oxford Pergamon Press; New York, NY
• 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; Pseudoelasticity; Phase transformations; Stress-strain relation; Copper base alloys; Experimental study; Zinc alloys; Aluminium alloys; Shape memory effect; Manganese alloys; Thermoelasticity; Thermomechanical treatments; Martensitic transitions; Transition element alloys
• ISSN: 0956-716X
• DOI: 10.1016/0956-716X(95)00205-A

The progress of thermoelastic martensitic transformations was studied in thermomechanical cycles by combined tension and torsion of thin wall specimens made of Cu-Al-Zn-Mn shape memory alloypolycrystals. The experimental results show, that the strain reversal from a general strain state during the reverse martensite to parent phase transformation depends mainly on acting external stresses and test temperature and not on the forward transformation history (on the shape of the forward transformation path). In particular, when deformed shape memory alloy specimens were heated at constant stress, the strain reversal proceeded always along the shortest possible strain trajectory in tension-torsion strain space in the direction towards the elastic strain state corresponding to the applied stress.