Pressure dependence of age-hardenability of aluminum cast alloys and coarsening of precipitates during hot isostatic pressing

Hafenstein, Stephan; Werner, Ewald

doi:10.1016/j.msea.2019.04.077

Cited by 27 publications

(11 citation statements)

References 40 publications

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“…This, in turn, benefits the solid solution hardening, but more importantly, the possible precipitation hardening of these alloys, whereby the artificial aging of the just solidified and quenched material starts instantaneously during the process, due to the common process temperatures of around 200 °C being in the regime of artificial aging temperatures of Al-Si-Mg alloys. An immediate artificial aging has the added benefit, that the stoichiometry of the formed clusters increases the effectiveness of the precipitation hardening, an effect which is well known from direct-aging heat treatments in cast Al-Si-Mg [39][40][41].…”

Section: Tensile Strength and Compressive Behaviourmentioning

confidence: 99%

Tensile and compressive behaviour of additively manufactured AlSi10Mg samples

et al. 2020

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Laser powder-bed fusion has become one of the most important techniques in additive manufacturing. For guaranteeing the possibility of manufacturing highly specialized and advanced components, currently intensive research is carried out in this field. One area of this research is the material-specific macroscopic anisotropy, which is investigated in our work by comprehensive static mechanical experiments. The material which was tested within this study was the precipitation-hardenable AlSi10Mg alloy, with the focus on installation space orientation. Tensile and compression tests were performed, the results for the Young's modulus in compressive loading exceeded the previously known values of this material in tensile loading and achieved values of up to 79.8 GPa. As a result of this investigation, a chemical spectroscopic analysis was undertaken and from the actual chemical composition, a relative density of 99.86% of the samples was determined.

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Section: Tensile Strength and Compressive Behaviourmentioning

confidence: 99%

Tensile and compressive behaviour of additively manufactured AlSi10Mg samples

et al. 2020

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“…AlSiMg alloys exhibit significantly higher strength and hardness compared to other aluminum alloys (Hafenstein and Werner, 2019). Due to the rapid cooling (10 5 to 10 6 K/s) from the melt to the preset preheating temperature in SLM, a supersaturated aluminum solid solution is obtained (Buchmayr et al, 2017).…”

Section: Hardnessmentioning

confidence: 99%

Additive Manufacturing: A Review of the Influence of Building Orientation and Post Heat Treatment on the Mechanical Properties of Aluminium Alloys

Sert

Öchsner

Hitzler

et al. 2019

Advanced Structured Materials

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Selective laser melting is one of the powder bed-based processes that allows a layered fabrication of components, which has become the most widely utilized additive manufacturing technique for metal processing. The ability to create futuristic designs and non-standard topology-optimized structures is one of the biggest advantages of additive manufacturing. On the other hand, one of the major challenges is to account for the anisotropic and inhomogeneous material properties. This work presents an overview of the most relevant studies, concerning the influence of building directions and post heat treatments on the mechanical properties of selective laser melted aluminium alloys.

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“…A pressure induced decease in the critical cooling rate allows direct aging of cast Al-Si-Mg alloys, if the cooling rate after hot isostatic pressing is high enough to avoid the precipitation of alloying elements during cooling [21,[26][27][28]. Modern hot isostatic presses are offering enhanced cooling capabilities, which allow the implementation of direct aging, a combined process of densification, solution annealing and artificial aging [29,30]. By avoiding pre-precipitate clustering of alloying elements at room temperature, direct aging of Al-Si-Mg alloys results in higher strength, compared to regular heat treatment [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion

et al. 2020

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Hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties of Al–Si–Mg alloys fabricated by laser powder-bed fusion (L-PBF). The implementation of post processing densification processes can open up new fields of application by meeting high quality requirements defined by aircraft and automotive industries. A gas pressure of 75 MPa during hot isostatic pressing lowers the critical cooling rate required to achieve a supersaturated solid solution. Direct aging uses this pressure related effect during heat treatment in modern hot isostatic presses, which offer advanced cooling capabilities, thereby avoiding the necessity of a separate solution annealing step for Al–Si–Mg cast alloys. Hot isostatic pressing, followed by rapid quenching, was applied to both sand cast as well as laser powder-bed fused Al–Si–Mg aluminum alloys. It was shown that the critical cooling rate required to achieve a supersaturated solid solution is significantly higher for additively manufactured, age-hardenable aluminum alloys than it is for comparable sand cast material. The application of hot isostatic pressing can be combined with heat treatment, consisting of solution annealing, quenching and direct aging, in order to achieve both a dense material with a small number of preferred locations for the initiation of fatigue cracks and a high material strength.

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Pressure dependence of age-hardenability of aluminum cast alloys and coarsening of precipitates during hot isostatic pressing

Cited by 27 publications

References 40 publications

Tensile and compressive behaviour of additively manufactured AlSi10Mg samples

Tensile and compressive behaviour of additively manufactured AlSi10Mg samples

Additive Manufacturing: A Review of the Influence of Building Orientation and Post Heat Treatment on the Mechanical Properties of Aluminium Alloys

Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion

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