Effect of quenching rate on microstructure and mechanical properties of commercial AA7108 aluminium alloy  

淬火速率对AA7108铝合金的微观结构和力学性能的影响(英文)

作　　者：Ida WESTERMANN Ann Leni HAUGSTAD Yngve LANGSRUD Knut MARTHINSEN 

机构地区：[1]SINTEF Materials and Chemistry,NO-7465,Trondheim,Norway [2]Department of Materials Science and Engineering,Norwegian University of Science and Technology,NO-7491,Trondheim,Norway [3]Benteler Aluminium Systems Norway AS,NO-2830,Raufoss,Norway

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第8期1872-1877,共6页中国有色金属学报（英文版）

摘　　要：A commercial AA7108 aluminium alloy subjected to different quenching procedures from the solid solution temperature of 480 ℃ was considered. Both continuously cooling and quenching to intermediate temperatures （400, 300 and 200 ℃） followed by different holding times were applied. All the materials were subsequently subjected to the same industrial two-step artificial ageing procedure to obtain a maximum strength （T6）. Tensile testing of the different quenched materials in the T6 temper reveals a large deviation in strength dependent on the cooling/holding time, compared with the reference sample. A collection of the different quenched materials was chosen for further investigation of the precipitate structure by transmission electron microscopy （TEM） to explain the differences in mechanical properties.在480°C固溶温度对AA7108铝合金进行不同工艺的淬火。将合金连续冷却、淬火至中间温度(400,300和200°C)并保温不同时间,再进行工业两步人工时效处理,以获得最大强度(T6)。T6态淬火材料的拉伸试验表明,材料的强度很大程度上取决于冷却/保温时间。通过透射电子显微镜(TEM)观察材料中沉淀物结构来解释材料的力学性能差异。

关 键 词：aluminium MICROSTRUCTURE precipitate free zone mechanical properties 

分 类 号：TG156.3[金属学及工艺—热处理]