A free-cutting and ductile CuAlMnZnTiB shape memory alloy

• Published in: Journal of Central South University Vol. 22; no. 2; pp. 416 - 421
• Main Authors: Liu, Na, Li, Zhou, Li, Ling, Liu, Bin, Li, Qing-tian, Xu, Gen-ying
• Format: Journal Article
• Language: English
• Published: Heidelberg Central South University 01.02.2015
• Subjects: Engineering; Metallic Materials; CuAlMnZnTiB shape memory alloy; free-cutting; mechanical properties
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-015-2537-3

The mechanical properties and cutting performance of the designed CuAlMnZnTiB shape memory alloy were studied by tensile test and microstructure observation. Using X-ray diffractometry, differential scanning calorimetry (DSC) and semi-quantitative shape memory effect test, the microstructure and shape memory effect were analyzed. It is found that lots of β phase and few α phase are formed in the quenching of Cu-7.5Al-9.7Mn-3.4Zn-0.3Ti-0.14B (mass fraction, %) alloy, a great deal of martensite and few α phase are formed in the aging alloy, while the annealing alloy is composed of a great deal of α phase and few β phase. The tensile strength and elongation of the annealed alloy are 649 MPa and 17.1%, respectively. Some tiny and dispersion distributed second phase particles are generated in Ti and B precipitates, greatly improving the alloy machinability.