The effect of homogenisation treatment on cold deformations of AA 2014 and AA 6063 alloys

Effet du temps et de la température sur l'homogénéisation d'un alliage d'aluminium AA6061 destiné au forgeage à chaud /

“…Le maintien, qui ne dépasse généralement pas 6h, permet aussi la dissolution de phases à bas point de fusion, principalement le MgiSi ainsi que l'élimination de gradients de microségrégation, tous deux pouvant mener à différents problèmes. L'homogénéisation des billettes telles que coulées demeure donc une étape préalable essentielle aux procédés à déformations sévères comme le forgeage ou l'extrusion [1,5,6].…”

Effects of Heat Treatment on Strength and Ductility of Rolled and Forged Aluminum 6063 Alloy

“…During casting, however, the slow cooling rate of the alloy allows for the strengthening Mg 2 Si phase to precipitate out of solution and grow into large incoherent phases within the matrix. In the as-cast structure, the large, incoherent nature of the Mg 2 Si phase does little to increase the strength of the alloy .To obtain finely dispersed Mg 2 Si, a solution heat treatment needs be conducted on the alloy. The process raises its temperature to near the melting point of the alloy but not high enough to initiate partial melting.…”

“…During quenching the alloy quickly cools from solution, locking the strengthening elements within the aluminum matrix. The alloy after quenching becomes meta-stable, where some silicon and magnesium crystals attempt to precipitate out as Mg 2 Si but cannot, since at room temperature, there is not enough energy for precipitation to occur. In aging, the part is raised to a high enough temperature to initiate precipitation of the Mg 2 Si.…”

“…The alloys were homogenized at 320, 370, 420 and 470 o C for 8 hours [2]. Torsion tests were performed on as-cast and homogenized alloys at room temperature and at a strain rate of 2×10 −2 s −1 .…”

Efectos del Tratamiento de Homogeneización en la Trabajabilidad de la Aleación CuNiSiCr

“…Sus resultados también demuestran que las mejoras en la homogeneización conducen a un aumento de la resistencia, ductilidad y energía de impacto. Totik et al,(2004) estudiaron el efecto de las condiciones del tratamiento térmico de homogeneizado sobre las deformaciones en frío aleaciones AA2014. Sus resultados indican que los tratamientos de homogeneizado convierten las segundas fases, que en principio son grandes y están localizadas en limite de grano, en pequeñas y esparcidas a través de los granos.…”