On the relationship between microstructure, strength and toughness in AA7050 aluminum alloy Export

@article{dumont03, abstract = {The effect of process parameters such as quench rate and precipitation heat treatment on the compromise between the toughness and the yield strength of AA7050 aluminum alloy (AlZnMgCu) are investigated, as well as the anisotropy of this compromise in the rolling plane. Fracture toughness is experimentally approached by the Kahn tear test. The microstructure is studied quantitatively in detail by a combination of scanning electron microscopy, transmission electron microscopy and small-angle X-ray scattering, and the relative fractions of the various fracture modes as a function of microstructural state are quantitatively determined on scanning electron microscopy images. Toughness is confirmed to be minimum at peak strength, and lower for an overaged material than for an underaged material of the same yield strength. A lower quench rate is shown to result in an overall reduction of toughness, and in a reduced evolution of this toughness during the aging heat treatment. The overall toughness is also lowered when the main crack propagation direction is parallel to the preferential elongation direction of the coarse constituent particles (rolling direction). The competition between intergranular and transgranular fracture is explained in terms of the modifications of the work hardening rate, and of grain boundary precipitation. The evolution of fracture toughness is qualitatively explained in terms of evolution of yield stress, strain hardening rate, grain boundary precipitation and intragranular quench-induced precipitates.}, author = {Dumont, D. and Deschamps, A. and Brechet, Y.}, citeulike-article-id = {449662}, citeulike-linkout-0 = {http://www.sciencedirect.com/science/article/B6TXD-48BKYB2-7/2/cdb1f9ff511e853f44b61b62cd6f6b71}, journal = {Materials Science and Engineering A}, keywords = {bibtex-import, fractography, grain, structure, toughness}, month = {September}, number = {1-2}, pages = {326--336}, posted-at = {2005-12-25 12:44:49}, priority = {2}, title = {On the relationship between microstructure, strength and toughness in {AA7050} aluminum alloy}, url = {http://www.sciencedirect.com/science/article/B6TXD-48BKYB2-7/2/cdb1f9ff511e853f44b61b62cd6f6b71}, volume = {356}, year = {2003} }

TY - JOUR ID - dumont03 L3 - citeulike-article-id:449662 N2 - The effect of process parameters such as quench rate and precipitation heat treatment on the compromise between the toughness and the yield strength of AA7050 aluminum alloy (AlZnMgCu) are investigated, as well as the anisotropy of this compromise in the rolling plane. Fracture toughness is experimentally approached by the Kahn tear test. The microstructure is studied quantitatively in detail by a combination of scanning electron microscopy, transmission electron microscopy and small-angle X-ray scattering, and the relative fractions of the various fracture modes as a function of microstructural state are quantitatively determined on scanning electron microscopy images. Toughness is confirmed to be minimum at peak strength, and lower for an overaged material than for an underaged material of the same yield strength. A lower quench rate is shown to result in an overall reduction of toughness, and in a reduced evolution of this toughness during the aging heat treatment. The overall toughness is also lowered when the main crack propagation direction is parallel to the preferential elongation direction of the coarse constituent particles (rolling direction). The competition between intergranular and transgranular fracture is explained in terms of the modifications of the work hardening rate, and of grain boundary precipitation. The evolution of fracture toughness is qualitatively explained in terms of evolution of yield stress, strain hardening rate, grain boundary precipitation and intragranular quench-induced precipitates. IS - 1-2 JF - Materials Science and Engineering A EP - 336 TI - On the relationship between microstructure, strength and toughness in {AA7050} aluminum alloy VL - 356 SP - 326 KW - bibtex-import KW - fractography KW - grain KW - structure KW - toughness AU - Dumont, D AU - Deschamps, A AU - Brechet, Y PY - 2003/September// UR - http://www.sciencedirect.com/science/article/B6TXD-48BKYB2-7/2/cdb1f9ff511e853f44b61b62cd6f6b71 ER -