Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

Tiryakioğlu, Murat

doi:10.3390/ma13092019

Cited by 17 publications

(9 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 36,37 ] Besides, deboning of Si‐rich particles was also mentioned to cause brittle behavior. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

On the Monotonic and Cyclic Behavior of an Al‐Mg‐Zn‐Cu‐Si Compositionally Complex Alloy

Sajadifar,

Baumgartner,

Krochmal

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

In the present study, monotonic and cyclic properties of a novel Al‐Mg‐Zn‐Cu‐Si compositionally complex alloy (CCA) were investigated. Microstructural studies revealed that eutectic phase and fishbone‐type structures are embedded by the Al matrix. The mechanical properties of this CCA obtained under compressive loading were found to be promising. However, low ultimate strength and brittle behavior were observed under tension. The fatigue performance of the alloy in the low‐cycle fatigue (LCF) regime was poor. Microstructural features and fracture surface analysis point to the fact that the presence of brittle intermetallic phases and shrinkage defects are responsible for the poor tensile properties and inferior LCF behavior. Homogenization at 460 °C and 465 °C for 3 h, 6 h and 24 h resulted in spheroidization of all coarse precipitates. However, the heat treatment used herein could not enhance the mechanical properties of this CCA.This article is protected by copyright. All rights reserved.

show abstract

“…[ 36,37 ] Besides, deboning of Si‐rich particles was also mentioned to cause brittle behavior. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

On the Monotonic and Cyclic Behavior of an Al‐Mg‐Zn‐Cu‐Si Compositionally Complex Alloy

Sajadifar,

Baumgartner,

Krochmal

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…The fatigue life of aluminium castings is strongly related to the solidification conditions and the structural quality of the material [1]. There is thus a strong focus in the literature on understanding the intrinsic and extrinsic effects in cast aluminium alloys [2], and extensive work has been made in the modelling of defects [3] and to understand and predict the impact of porosities on mechanical properties and fatigue life [4][5][6][7]. However, at an early design stage, where only a preliminary geometry and type of casting process are known, an attempt to precisely predict the distribution and morphology of porosities and many other defects is an impossible task.…”

Section: Introductionmentioning

confidence: 99%

Integrated fatigue life predictions of aluminium castings using simulated local microstructure and defects

Olofsson

2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

In this work, an integrated simulation approach previously developed for static FE analyses is extended to microstructure- and defect-based fatigue life assessments of castings. The approach, the closed chain of simulations for cast components, combines casting process simulation with microstructure modelling and local material characterisation to generate heterogeneous material data for FE analysis and fatigue life assessment. The method is demonstrated on a High-Pressure Die Cast aluminium component. Areas with a high risk of defects are identified based on the simulated solidification conditions, and heterogeneous material data for the fatigue life analysis is generated. Fatigue testing has been performed with different levels of porosities to quantify the effect of defects on the element-specific Wöhler curves. Pore characteristics are assessed using 2D X-ray, fracture surface analysis and Kitagawa diagram. The results highlight the importance of taking the risk of defect formation into consideration when designing industrial aluminium castings subjected to fatigue loads.

show abstract

“…[10][11][12] It was also hypothesized that the presence of bifilms has a remarkable effect on the heterogeneous nucleation of various intermetallic phases and Si particles (primary as well as eutectic) in Al-Si alloys. [13,14] Traditionally, solute hydrogen is considered the main contributor to microporosity formation in aluminum alloys. [15] The solubility of hydrogen in aluminum is considerably lower in the solid than in the liquid state.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rotary Degassing Treatments with Different Purging Gases on the Double Oxide- and Nitride Film Content of Liquid Aluminum Alloys

Gyarmati

Vincze

Fegyverneki

et al. 2022

Metall Mater Trans B

View full text Add to dashboard Cite

Rotary degassing is one of the most frequently used melt treatment technologies used for processing liquid aluminum alloys. Despite this, the information available about the possible effects of this method on the double oxide- and nitride film (bifilm) content, especially when using different purging gases, is quite limited. For this reason, in this study, the effects of multiple rotary degassing treatments conducted with N2 and Ar purging gases on the bifilm quantity of a casting aluminum alloy were compared. The characterization of the melt quality was realized by the computed tomographic (CT) analysis of reduced pressure test (RPT) specimens, image analysis, and scanning electron microscopy (SEM) of the fracture surfaces of K-mold samples. Based on the results, by the application of Ar as a purging gas, relatively low bifilm content can be achieved. On the other hand, while the use of N2 leads to the formation of numerous small-sized nitride bifilms, which significantly increased the pore number density inside the RPT specimens. This can be associated with the nitride formation by the chemical reaction between the liquid aluminum alloy and the N2 purging gas bubbles during the degassing treatments. Graphical abstract

show abstract

Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys

Cited by 17 publications

References 105 publications

On the Monotonic and Cyclic Behavior of an Al‐Mg‐Zn‐Cu‐Si Compositionally Complex Alloy

On the Monotonic and Cyclic Behavior of an Al‐Mg‐Zn‐Cu‐Si Compositionally Complex Alloy

Integrated fatigue life predictions of aluminium castings using simulated local microstructure and defects

The Effect of Rotary Degassing Treatments with Different Purging Gases on the Double Oxide- and Nitride Film Content of Liquid Aluminum Alloys

Contact Info

Product

Resources

About