Effect of natural ageing and pre-straining on strength and anisotropy in aluminium alloy AA 6016

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

“…Note that the justification of implementing Eq. [10] in NaMo-Version 2 relies solely on the fact that it has proved to work well in many other situations, [21][22][23][24][25][26][27][28][29]42,48] since the assumption of linear additive strength contributions is just one of several possible options to choose from when calculating r y . [1,2,65] In the original yield strength model, a constant Taylor factor of 3.1 is assumed when calculating r y .…”

“…[20][21][22] Later, it has been renamed the nanostructure model (NaMo) in order to reach out to a wider audience and make the work accessible to people with a background in finite element simulations and advanced structural analyses as well. [23][24][25][26][27] Referring to Figure 1, NaMo-Version 1 divides the age-hardening process into two main stages, i.e., the solution heat treatment (SHT) stage and the artificial aging (AA) stage, based on a simplified description of the artificial aging reaction sequence. [20][21][22] At the same time, the important alloy composition dependence of the artificial aging reactions is accounted for through the use of a separate thermodynamic (TD) model, which provides quantitative information about the thermal stability of the different stable and metastable precipitates involved.…”

“…At any time during the artificial aging process, the resulting stress-strain curve at RT can be calculated from the integrated yield strength and work-hardening models for different thermomechanical treatments and alloy compositions and used in more advanced numerical analyses of the mechanical integrity of real aluminum structures. [22][23][24][25][26][27]29,30] In the following, both the new and the adapted models being implemented in NaMo-Version 2 will be described more in detail. Then the experimental program, which has been designed to generate data for calibration and validation of the same models, is outlined.…”

Texture, Microstructure and Mechanical Properties of 6111 Aluminum Alloy Subject to Rolling Deformation

“…Since 6xxx aluminum alloys (Al-Mg-Si-Cu series) show good bake hardening temper, 6xxx aluminum alloys are well suitable for automotive skin and other structure members in machinery 6 . The fabrication process of a typical 6xxx alloy mainly consists of casting, scalping, homogenization, hot rolling, intermediate annealing, cold rolling, solution treatment, pre-aging, natural aging, forming, painting and paint baking 2,7 .…”

Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation

“…Mostly only hardness measurements or yield strength values are given [12,17,18]. Tensile test curves are usually displayed insufficiently to detect the flow onset behaviour, due to dynamic recovery, or for pre-deformations [31] which are too small to obtain a pronounced area signifying the start of flow, or for a heat treatment having been already carried out after the deformation [19,20], or for the plateau of the flow onset having already recovered. At 10% pre-deformation in Figure 4a,b, a significant effect of the deformation temperature is visible, and the LN 2 pre-strained samples exhibit tensile test curves that have shifted to greater values.…”