Grain size and temperature influence on the toughness of a CuAlBe shape memory alloy

• Type: Article in International Scientific Journal
• Date: 2010

Authors

de Albuquerque, VHC (Author) Other; Melo, TAD (Author) Other; Gomes, RM (Author) Other; de Lima, SJG (Author) Other; João Manuel R. S. Tavares (Author) FEUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Vol. 528

Pages: 459-466

ISSN: 0921-5093

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-003-0WV

DOI: 10.1016/j.msea.2010.09.034

Abstract (EN): This work is a study of the influence of grain size and temperature on the toughness of CuAlBe shape memory alloys with (CuAlBeNbNi) and without NbNi (CuAlBe) grain refiner elements. The toughness analysis was based on the V-notch Charpy impact test under temperatures of -150, -100, -50, 0, 50, 100 and 150 degrees C. A statistical analysis of the results led to the conclusion that the toughness of both alloys was influenced by temperature and grain size. The CuAlBeNbNi alloy absorbed higher impact energy than the CuAlBe alloy showing that the refining elements improved the toughness of the alloy. To confirm and complement these findings, the fracture surfaces were evaluated by stereomicroscopy. Smooth homogeneous surfaces and rough heterogonous surfaces were detected for the CuAlBeNbNi and CuAlBe alloys, respectively. Predominately brittle zones were confirmed by scanning electron microscopy in both alloys. Furthermore, to determine the phase transformation temperatures and the associated microstructures, the alloys were assessed by conventional differential scanning calorimetry (DSC) and DSC with optical microscopy.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8