Mechanical properties and corrosion behaviour of ultrafine-grained AA6082 produced by equal-channel angular pressing
Mechanical properties and corrosion behaviour of ultrafine-grained AA6082 produced by equal-channel angular pressing
复制标题
DOI：
10.1007/s10853-008-2724-9
复制
发表时间：
2008-12-01
影响因子：
4.5
通讯作者：
Krueger, Lutz
中科院分区：
文献类型：
--
作者：
Hockauf, Matthias;Meyer, Lothar W.;Krueger, Lutz
研究了具有超细晶（UFG）微观结构的AA6082的力学性能和腐蚀行为。该材料在室温下在具有主动背压的 90A 度模具中通过等通道角压 (ECAP) 进行最多八次挤压加工。除了提供最大强度和显着降低延展性的峰值时效回火外，还考虑了固溶热处理条件。结合 ECAP 后时效，实现了最佳的高强度、延展性和冲击韧性。与未处理的材料相比，UFG 材料的腐蚀调查和腐蚀损伤检查显示出更高的耐点蚀能力。优化的条件用于生产螺钉原型，与 CG 对应件的相同制造的螺钉相比，该螺钉原型显示出明显更高的强度和延展性。此类材料是多种工程应用的潜在候选材料，例如即使在较高温度下的高强度螺钉。
The mechanical properties and corrosion behaviour of AA6082 with ultrafine-grained (UFG) microstructure were investigated. The material was processed by equal-channel angular pressing (ECAP) up to eight extrusions at room temperature in a 90A degrees-die with active backpressure. Besides the peak-aged temper, which provides maximum strengths and strongly reduced ductility, the solution heat treated condition was considered as well. Combined with post-ECAP aging, an optimum of high strength, ductility and impact toughness was achieved. The corrosion investigations and the examination of the corrosion damage of the UFG-materials show higher pitting corrosion resistance compared to the unprocessed material. The optimised condition was used for the production of screw prototypes which showed appreciable higher strength and ductility compared to the identically manufactured screws from the CG counterpart. Such materials are potential candidates to be used for several engineering applications such as high strength screws even at higher temperatures.