Microstructural analysis of CuAlNiMn shape-memory alloy before and after the tensile testing

Scientific paper - Original scientific paper

• Title (slovene): ANALIZA MIKROSTRUKTURE ZLITINE CuAlNiMn Z OBLIKOVNIM SPOMINOM PRED NATEZNIM PREIZKUSOM IN PO NJEM
• Author: Ivana Ivanić
• Author: Mirko Gojić
• Author: Stjepan Kožuh
• Author: Borut Kosec
• Author's institution: University of Zagreb; Faculty of Metallurgy
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

In this paper the results of a microstructural analysis before and after fracture along with the mechanical properties and hardness of the CuAlNiMn shape-memory alloy are presented. The melting of the alloy was carried out in a vacuum-induction furnace in a protective atmosphere of argon. The alloy was cast into an ingot of 15 kg. After casting the alloy was forged and rolled into rods with a diameter of approximately 10 mm. A microstructural characterization was performed with light microscopy (LM) and scanning electron microscopy (SEM) equipped with energy-dispersive spectrometry (EDS). Martensitic microstructure was observed in the rods after the deformation. The fractographic analysis of the samples after the tensile testing revealed some areas with intergranular fracture. However, the greater part of the fracture surface indicated the pattern of transgranular brittle fracture. The results of the tensile tests showed the tensile strength of 401.39 MPa and elongation of 1.64 %. The hardness of the CuAlNiMn alloy is 290.7 HV0.5.

Abstract (slovene)

V prispevku so predstavljeni rezultati analize mikrostrukture pred prelomom in po njem skupaj z mehanskimi lastnostmi in trdoto zlitine CuAlNiMn z oblikovnim spominom. Taljenje zlitine je bilo izvedeno v vakuumski pe~i v za{~itni atmosferi argona. Zlitina je bila ulita v ingot mase 15 kg. Po litju je bila zlitina kovana in zvaljana na premer pribli`no 10 mm. Karakterizacija mikrostrukture je bila izvedena s svetlobno mikroskopijo (SM) in vrsti~no elektronsko mikroskopijo (SEM), opremljeno z energijskim disperzijskim spektrometrom (EDS). Analizirana je bila martenzitna mikrostruktura zlitine CuAlNiMn pred izvedenim nateznim preizkusom. Izvedena sta bila natezni preizkus in meritve trdot. Fraktografska analiza je pokazala ve~ podro~ij z interkristalnim in pogosto transkristalnim krhkim prelomom. Rezultati nateznega preizkusa so pokazali, da je natezna trdnost 401,39 MPa in raztezek 1,64 %. Trdota zlitine CuAlNiMn je 290,7 HV0,5.

• Keywords (english): shape-memory alloy; CuAlNiMn; fracture analysis; microstructure; hardness
• Keywords (slovene): zlitina z oblikovnim spominom; CuAlNiMn; analiza preloma; mikrostruktura; trdota
• Language: english
• Language: slovene
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review
• Publication version: Published version
• Journal title: Materiali in tehnologije
• Numbering: vol. 48, no. 5, pp. 713-718
• p-ISSN: 1580-2949
• e-ISSN: 1580-3414
• URN:NBN: urn:nbn:hr:115:226928
• Publication: 2014
• Document URL: http://mit.imt.si/Revija/izvodi/mit145/ivanic.pdf
• Type of resource: Text
• Access conditions: Open access
• Created on: 2017-03-09 10:02:47