Influence of pre-compression on the ductility of AA6xxx aluminium alloys
Influence of pre-compression on the ductility of AA6xxx aluminium alloys
复制标题
预压缩对AA6xxx铝合金延展性的影响
DOI：
10.1007/s10704-017-0204-4
复制
发表时间：
2017
影响因子：
2.5
通讯作者：
O. Hopperstad
中科院分区：
文献类型：
--
作者：
B. H. Frodal;K. Pedersen;T. Børvik;O. Hopperstad
通过反复加载试验，研究了预压缩对3种铝合金塑性的影响。Diabolo形状的试样从挤出型材沿着横向方向机加工，并热处理至峰值强度（T6回火）。对样本进行五种不同水平的预压缩（0、10、20、30、40%），即，首先将试样压缩至规定的应变，然后拉伸至断裂。使用基于激光的测量系统，在测试期间连续测量挤出方向和厚度方向上的最小直径，直到断裂。AA6060、AA6082.25和AA6082.50三种铝合金具有不同的晶粒组织和织构。AA6060和AA6082.50合金具有再结晶晶粒组织，分别具有等轴晶粒和大的细长晶粒。AA6082.25合金具有非再结晶的纤维状晶粒结构。结果表明，预压缩对铝合金的塑性有显著的影响，而塑性的大小取决于合金的显微组织和强度。以压缩构型为参考构型，可以计算相对破坏应变。对于AA6060合金，相对失效应变随着预压缩的增加而增加，并且与纯拉伸相比，40%预压缩的相对失效应变大约增加一倍。对于AA6082.25合金，随着预压缩的增加，观察到相对失效应变略有增加，而对于AA6082.50合金，相对失效应变较低，并且对于不同的预压缩水平，相对失效应变近似恒定。
Reversed loading experiments were conducted to study the influence of pre-compression on the ductility of three aluminium alloys. Diabolo-shaped specimens were machined from extruded profiles along the transverse direction, and heat treated to peak strength (T6 temper). The specimens were subjected to five different levels of pre-compression (0, 10, 20, 30, 40%), i.e., the specimens were first compressed to a prescribed strain and then pulled to fracture in tension. Using a laser-based measuring system, the minimum diameter in the extrusion direction and thickness direction were continuously measured during the tests until fracture. The three aluminium alloys AA6060, AA6082.25 and AA6082.50 had different grain structure and texture. The AA6060 and AA6082.50 alloys had recrystallized grain structure with equi-axed grains and large elongated grains, respectively. The AA6082.25 alloy had a non-recrystallized, fibrous grain structure. It was found that pre-compression has a marked influence on the ductility of the aluminium alloys, which depends on the microstructure and strength of the alloy. Using the compressed configuration as the reference configuration, the relative failure strain could be calculated. For the AA6060 alloy, the relative failure strain increased for increasing pre-compression, and was approximately doubled for 40% pre-compression compared to pure tension. For the AA6082.25 alloy, a slight increase in the relative failure strain was observed for increasing pre-compression, while for the AA6082.50 alloy the relative failure strain was low and approximately constant for different levels of pre-compression.
影响因子：
9.4
作者：
Pineau, A.;Benzerga, A. A.;Pardoen, T.
通讯作者：
Pardoen, T.