Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing

Yu, Huali; Qin, Yiwei; Liu, Guanqun; Peng, Zhenyu; Tu, Xiaoxuan; Su, H.; Xiao, Yuxiang; Zhong, Qi; Wang, Sen; Cai, Zhenyang; Zhao, Xiaojun

doi:10.3390/ma16072675

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…Thus, the modified alloys, especially, the B390-P-Bi alloy presenting many finer dimples, were observed on the fracture surfaces. Vuksanovic et al (2021) [51] and Xiao et al (2023) [52] indicated that dimples on fracture surfaces were present after the T6 heat treatment and they were significant on the surfaces of the Al-12.5Si alloy and Al-Si-Cu-Mg-Ni-Cr. Due to the rounding and coarsening of eutectic silicon phase, there was increased resistance to fracture.…”

Section: Fracture Surfacesmentioning

confidence: 99%

Effect of heat treatment on microstructural characteristics and mechanical properties of hypereutectic B390 aluminium alloys modified by phosphorus and bismuth

Jiandon,

Talangkun,

Ponhan

2024

Mater. Res. Express

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This study investigated the effects of solution treatment and aging processes on microstructural characteristics and mechanical properties of hypereutectic B390 Al-Si Alloy modified by phosphorus (P) and bismuth (Bi). The morphology evolution of primary Si, eutectic Si, intermetallic compounds, and secondary dendrite arm spacing (SDAS) of both initial and modified alloys were investigated in as-cast and heat-treated conditions. It was found that the combination of 0.1 wt%P and 0.5 wt%Bi in B390 alloy resulted in a remarkable modification and refinement of primary Si, eutectic Si, and SDAS compared to initial specimens in the as-cast condition. After heat treating, the fine lamellar eutectic Si and intermetallic compounds underwent a higher degree of fragmentation and coarsening, appearing as small round particles, leading to a more pronounced formation of a supersaturated solid solution. Additionally, the peak aging time of the B390-P-Bi alloy was only 7 hours, 2 hours less than the initial specimen. After T6 treatment and addition of both 0.1 wt%P and 0.5 wt%Bi, the B390-P-Bi alloy exhibited a smaller rounded Mg3Bi2 phase at peak aging with a 62.07% size reduction compared to the B390-Bi alloy. The results show that adding P with Bi enhanced hardness, ultimate tensile strength (UTS) and elongation because of refinement of the SDAS, primary Si and eutectic Si. These refinements played a crucial role in increasing tensile strength by more effective strengthening through precipitation and grain size reduction. The B390-P-Bi alloy is a promising choice for applications requiring a balance between strength and ductility.

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Section: Fracture Surfacesmentioning

confidence: 99%

Effect of heat treatment on microstructural characteristics and mechanical properties of hypereutectic B390 aluminium alloys modified by phosphorus and bismuth

Jiandon,

Talangkun,

Ponhan

2024

Mater. Res. Express

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“…The Q phase is a key phase in Al alloys, including not only 6xxx series Cu-added Al-Mg-Si alloys [ 7 ], but also 4xxx series Cu-added Al-Si-Mg alloys [ 8 , 9 ] and 2xxx series Si-added Al-Cu-Mg alloys [ 10 ], existing as as-cast constituents [ 8 , 10 ] and nano-precipitates [ 9 , 11 ]. Abundant research has been conducted to clarify the precipitation behaviors of Al-Mg-Si(-Cu) alloys during age hardening, especially paint bake hardening, a typical heat treatment process for auto body panels [ 5 ], thus guiding the design of new generations of alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys

Li,

Yu,

et al. 2023

Materials

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Cu additions notably strengthen Al-Mg-Si and Al-Si-Mg alloys due to the dense precipitation of quaternary nano precipitates during ageing. However, the chemical evolution and mechanical behaviors of the quaternary micro-scale Q constituent phase occurring in cast and homogenized states have rarely been studied. Meanwhile, there exists a type of AlCuMgSi cluster in the cast state, which has been regarded as Q particles. The accurate identification of phase constituents is the basis for the future design of alloys with better performance. In our work, this type of cluster was revealed to consist of α-Al, θ-Al2Cu, Q, and Si phases through micro-to-atomic scale studies using scanning and transmission electron microscopes. The skeleton of the dendrite was θ phase. The second phases in the dendritic eutectic cluster dissolved quickly during a 4 h homogenization at 550 °C. The Q phase was found to effectively absorb the Fe impurities during casting and homogenization. As a result, the formation of other harmful Fe-rich intermetallics was suppressed. These Q constituent particles were observed to break into separate pieces in an intermediately brittle manner when compressed in situ in a scanning electron microscope. These findings provide insights into the thermodynamic modeling of the Al-Mg-Si-Cu system and alloy design.

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“…Flemings, is an advanced forming process [ 7 , 8 ]. Compared with the hot die forging process, the forming force for the SSMF process is significantly decreased, due to the low flow stress and the good filling characteristic of the semi-solid metals, and the mechanical properties of the formed parts are close to those of the materials under the hot die forging condition [ 9 , 10 , 11 ]. As one of the SSFM processes, the semi-solid thixotropic forging forming (SSTFF) process, including the preparation of ideal semi-solid billets and the forging forming of components, has received extensive attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Study on the Semi-Solid Thixotropic Forging Forming Process for the Low-Carbon Steel Claw Pole

Wang²,

et al. 2023

Materials

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Low-carbon steel has been popularly applied in numerous applications because of its unique features, such as good plasticity, high strength, great hardness, and excellent toughness. Additionally, the semi-solid thixotropic forging forming method has been widely used in light alloys, due to its advantages of low forming force and high forming quality, whereas its application in ferrous materials is still limited. In this study, the semi-solid thixotropic forging forming process is proposed for producing the low-carbon steel claw pole, with the main stages being radial forging deformation, isothermal treatment, and forging forming. The effect of the area reduction rate on the effective strain from the cross sections of the radial-forged metal bar was studied using numerical simulations. The effect of the isothermal holding process on the microstructures of radial-forged billets was investigated, to obtain the ideal semi-solid microstructures. The microstructure and mechanical properties of low-carbon steel claw poles from the thixotropic forging experiment are presented and discussed. It was found that when the area reduction rate was 67%, the effective strain at the edge of the metal bar exceeded 5.0, while the effective strain at the center was above 1.2, indicating an excellent quality of forging for the bar. The optimization of the process parameters for preparing low-carbon steel semi-solid billets with fine and globular microstructures was achieved with an area reduction rate of 67%, an isothermal temperature of 1500 °C, and a duration time of 15 min. Moreover, the low-carbon steel claw pole fabricated with the optimized operating parameters was found fully filled, with a sharp profile and a flat surface, where the yield strength and tensile strength increased by 88.5% and 79.8%, respectively, compared to the starting materials.

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Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing

Cited by 5 publications

References 39 publications

Effect of heat treatment on microstructural characteristics and mechanical properties of hypereutectic B390 aluminium alloys modified by phosphorus and bismuth

Effect of heat treatment on microstructural characteristics and mechanical properties of hypereutectic B390 aluminium alloys modified by phosphorus and bismuth

Microstructure and Mechanical Behavior of Quaternary Eutectic α+θ+Q+Si Clusters in As-Cast Al-Mg-Si-Cu Alloys

Study on the Semi-Solid Thixotropic Forging Forming Process for the Low-Carbon Steel Claw Pole

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