Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-927 - C7-932
DOI http://dx.doi.org/10.1051/jp4:19937143
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-927-C7-932

DOI: 10.1051/jp4:19937143

Mechanical properties and microstructure of laser treated Al-Cu-Mg alloys

J.Th.M. DE HOSSON and J. NOORDHUIS

Department of Applied Physics, University of Groningen, Zernike Complex, Nijenborgh 4, 9747 AG Groningen, The Netherlands


Abstract
The mechanical properties and microstructural features of Al-Cu-Mg alloys were investigated, as exposed to laser treatments at various scan velocities. As far as the mechanical property is concerned a striking observation is a minimum in the hardness value at a laser scan velocity of 1/2 cm/s. Usually an increasing hardness with increasing laser scan velocities is reported in the literature. This remarkable property could be explained based on the microstructural features observed by transmission electron microscopy. After subsequent shot peening, in all cases the formation of precipitates was observed, independent of the laser scan velocities originally applied. This phenomenon of precipitation, induced by shot peening afterwards is most striking at a high concentration of alloying elements in solid solution. Since this is the case in samples treated at a low scan velocity (i.e. an increased homogenization time) as well as in samples treated at a high scan velocity samples (high quench rates), the parabola shape is maintained even after shot peening.



© EDP Sciences 1993