Effect of Fe content on fracture behavior of Ni–Mn–Fe–Ga ferromagnetic shape memory alloys

✍ Scribed by H.B. Wang; F. Chen; Z.Y. Gao; W. Cai; L.C. Zhao

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 353 KB
• Volume: 438-440
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.01.101

✦ Synopsis

The effect of Fe content on hardness and toughness of Ni 48.7 Mn 30.1-x Fe x Ga 21.2 (x = 0-11, number indicates at.%) alloys is investigated and the relationship between the fracture toughness and the fractography is discussed by observing the fracture morphology and analyzing the propagation of the crack. The micro-Vickers hardness results indicate that the hardness increases with increasing Fe content. The fracture toughness results indicate that Fe doping has improved the toughness of Ni-Mn-Ga alloys, and the toughness increases with increasing Fe content in Ni 48.7 Mn 30.1-x Fe x Ga 21.2 (x = 0-11) alloys. Fracture morphology shows typical intergranular fracture with rock candy pattern in the Ni 48.7 Mn 30.1 Ga 21.2 (x = 0) and river pattern cleavage fracture facets in the Ni 48.7 Mn 19.1 Fe 11 Ga 21.2 (x = 11) alloy. The fracture type changing from intergranular fracture to transgranular fracture is the main reason for the improved toughness of Ni-Mn-Ga alloys by addition of Fe.