dc.contributor.author | Huang, Yucong | |
dc.contributor.author | Aziz, Michael | |
dc.contributor.author | Hutchinson, John | |
dc.contributor.author | Evans, Anthony G. | |
dc.contributor.author | Saha, R. | |
dc.contributor.author | Nix, Wiliam D. | |
dc.date.accessioned | 2009-04-20T18:15:30Z | |
dc.date.issued | 2001 | |
dc.identifier.citation | Huang, Yucong, Michael J. Aziz, John W. Hutchinson, Anthony G. Evans, R. Saha, and William D. Nix. 2001. Comparison of Mechanical Properties of Ni[sub]3Al Thin Films in Disordered FCC and Ordered L1[sub]2 Phases. Acta materialia 49(14): 2853-2861. | en |
dc.identifier.issn | 1359-6454 | en |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:2797290 | |
dc.description.abstract | We report the results of several experiments isolating the effect of long-range order on mechanical properties of intermetallic compounds. Kinetically disordered FCC Ni<sub>3</sub>Al (Ni 76%) thin films were produced by rapid solidification following pulsed laser melting. For comparison, compositionally and microstructurally identical films with ordered L1<sub>2</sub> structure were produced by subsequent annealing at 550 °C for 2 hours. These FCC and L1<sub>2</sub> Ni<sub>3</sub>Al thin films were tested by nanoindentation for hardness and Young’s modulus, and the critical strain to fracture was measured by straining the substrate under four-point bending. Ni<sub>3</sub>Al thin films in the disordered phase were found to have nearly twice the critical strain to fracture, more than three times the fracture toughness, and about 20% lower hardness than in the ordered counterpart. Blunter crack tips and crack bridging observed in the disordered phase also illustrate increased ductility. The increased plasticity of Ni<sub>3</sub>Al due to chemical disorder is manifested both within the grains and at the grain boundaries. Young’s moduli of the ordered and disordered materials were found to be indistinguishable. | en |
dc.description.sponsorship | Engineering and Applied Sciences | en |
dc.language.iso | en_US | en |
dc.publisher | Elsevier Science B.V., Amsterdam | en |
dc.relation.isversionof | http://dx.doi.org/10.1016/S1359-6454(01)00094-5 | en |
dc.relation.hasversion | http://www.seas.harvard.edu/matsci/people/aziz/publications/mja133.pdf | en |
dash.license | LAA | |
dc.subject | order-disorder phenomena | en |
dc.subject | hardness testing | en |
dc.subject | intermetallic compounds | en |
dc.subject | toughness | en |
dc.subject | rapid solidification | en |
dc.title | Comparison of Mechanical Properties of Ni[sub]3Al Thin Films in Disordered FCC and Ordered L1[sub]2 Phases | en |
dc.relation.journal | Acta Materialia | en |
dash.depositing.author | Aziz, Michael | |
dc.identifier.doi | 10.1016/S1359-6454(01)00094-5 | * |
dash.contributor.affiliated | Hutchinson, John | |
dash.contributor.affiliated | Aziz, Michael | |