Alloying- and heating mode dependent microstructure of brazed AISI 304/AlGeSi/AA6082 joints and its influence on the static and cyclic performance

AISI 304/AlGeSi/AA6082 钎焊接头的合金化和加热模式相关显微组织及其对静态和循环性能的影响

基本信息

项目摘要

Joints of aluminum and stainless steel are of special interest for the automotive industry, aerospace and highpower semiconductor device technologies due to the good mechanical properties of the stainless steel in combination with the low specific weight of aluminum alloys. In case of medium strength aluminum alloys, the joints are commonly manufactured using Al-Si brazing fillers with a melting temperature of 575°C. However, the development of advanced high-performance products requires the replacement of existing alloys with high-strength aluminum alloys, whose melting point is significantly lower. With existing filler metals, it is almost impossible to braze high-strength alloys, because a degradation of the mechanical properties or even localized melting of the aluminum alloys can occur. The development of low-melting brazing fillers based on the ternary system Al-Ge-Si allows the joining of stainless steel and high-strength, up to now non-brazeable, Al-alloys. These brazing alloys were developed and are further optimized at MEPHI. Preliminary investigations show the possibility to achieve a melting point lower than that of Al-Si alloys, because a ternary eutectic composition exists. The rapid quenching technology is based on ultra-fast quenching of the melt which solidifies as amorphous or nano-crystalline foils with homogeneously distributed alloying elements. These foils are rather thin (50-70 µm), which means that a low erosion of the base materials occurs, because less dissolution phenomena go on during brazing. Brazing is carried out using two different processes: induction brazing and vacuum furnace brazing. The first one ensures the suppression of thermodynamically stable intermetallic phases, the second one leads to a good homogenization of the joints. By now, there are no fundamental studies on the microstructure formation and structure-property relationships of high-strength aluminum alloys/stainless steel brazed joints in dependence on the brazing process. Induction brazing (at TUC) and vacuum furnace brazing (at MEPHI) are used to produce aluminum alloy/stainless steel joints. Due to the short time and local heat input, after induction brazing, good mechanical properties are expected. In contrast to that, vacuum brazing with long holding times leads to completely different diffusion processes in the reaction zone. By comparing the resulting microstructures, it is possible to understand the kinetics of the formation of the reaction zone and their influence on the mechanical properties of the joints. In addition to the knowledge of the monotonic mechanical properties, it is necessary to investigate the fatigue behavior in order to determine potential lifetimes of the joints. The fracture surfaces are investigated to understand the structure-property relationships of the joints. As a result, a fundamental basis for the development and application of high-strength aluminum alloys/stainless steel brazed joints will be generated.
铝和钢的关节对二氧化碳的良好机械性能特别感兴趣。使用高强度的铝合金,其熔点明显较低,而填充金属几乎不可能燃烧高强度的合金,因为铝的机械性能熔化允许降解。 - 基于三元系统的铜填充物允许在梅菲(Mephi)上加入不锈钢。存在三元的共晶组成。 Lowe底座材料是使用不同的过程进行的:浸入式悬挂和真空熔炉,确保了热力学稳定的粒子间相,第二个导致关节的良好均匀化。高强度的合金/不锈钢接头依赖于铜制的过程(在TUC上),真空炉(在Mephi处)用于产生良好的机械性能。与之形成鲜明对比的是,在R相互作用区域中,真空吸尘器很长时间。特性HE关节。裂缝表面在关节的结构范围内,用于开发和应用高强度的铝制。

项目成果

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Professor Dr.-Ing. Guntram Wagner其他文献

Professor Dr.-Ing. Guntram Wagner的其他文献

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{{ truncateString('Professor Dr.-Ing. Guntram Wagner', 18)}}的其他基金

Mechanism-correlated characterization of the deformation and damage behavior of thermo-plastic-based fiber metal laminates for property-oriented process development
热塑性纤维金属层压板变形和损伤行为的机制相关表征,用于性能导向的工艺开发
  • 批准号:
    414332488
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Fatigue behavior of aluminum-matrix-composites (AMC) in the range of high number of cycles
铝基复合材料(AMC)在高循环次数范围内的疲劳行为
  • 批准号:
    161384115
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Charakterisierung des Ermüdungsverhaltens von Mg/Mg-FSW- und Mg/Al-Verbunden unter besonderer Berücksichtigung korrosiver Einflüsse.
Mg/Mg-FSW 和 Mg/Al 复合材料的疲劳行为表征,特别考虑腐蚀影响。
  • 批准号:
    24388282
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

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