Effects of solution treatment on microstructure and mechanical properties of thixoformed Mg2Sip/AM60B composite

Cheng, Faliang; Chen, T.J.; Qi, Yongnian; Zhang, S.Q.; Yao, Pin-Chuan

doi:10.1016/j.jallcom.2015.02.147

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…In an attempt to deeply understand the above depicted grain coarsening behavior in the PTF alloy, the size variation curves were fitted to determine its obeyed function, which is displayed in Fig.5. It reveals that the growth of the two kinds of grains complies with the traditional growth model within 535ºC ( Fig.5a) 25 : (1)…”

Section: Influence Of Solution Temperature On Microstructuresupporting

confidence: 66%

“…When the PTF alloy was subjected to solution treatment at 560ºC for 3h, lots of flat facets that resulted from cracks propagating across primary α-Al phases appeared (Fig.9b). This indicated that the fracture of PTF alloy may follow a transgranular mode at this time, which was a sign of improved tensile strengths for the thixoformed materials 22,25 . Besides, the amount of the dimples became less but its size was observed to be larger than the as-fabricated state, suggesting an improvement in the elongation of the PTF alloy after solution treatment.…”

Section: Influence Of Solution Temperature On Tensile Propertiesmentioning

confidence: 90%

“…The obtained results suggest that the n values are 0.87 and 1.23 for the primary α phases and secondarily primary α phases, respectively. It is generally accepted that when n is less than 2, the main motivation for the grain coarsening would be the phase transformation 25 . It can therefore be concluded that the dissolution of eutectic phases plays a dominative role in the growth of these two kinds of grains within 535ºC.…”

Section: Influence Of Solution Temperature On Microstructurementioning

confidence: 99%

“…The solution treatment gives rise to the dissolution of the Mg 2 Si phase into the α-Al phase and therefore the effect of solid solution strengthening is improved, leading to a continuous enhancement of the tensile strengths when the temperature is lower than 560ºC. The elongation increase is primarily ascribed to the composition homogenization as well as the enhanced deformation coordination 25 . It must be noted that the effect of solid solution strengthening remains unchanged due to the complete dissolution of Mg 2 Si phase at the solutionization temperature of 585ºC and the grains of this alloy are severely coarsened at this time, consequently degrading the tensile properties of PTF alloy to some extent.…”

Section: Influence Of Solution Temperature On Microstructurementioning

confidence: 99%

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Solution Treatment Behaviors of 6061 Aluminum Alloy Prepared by Powder Thixoforming

Zhang

Chen

2018

Mat. Res.

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Powder thixoforming (PTF) was a promising processing technology that can be used to fabricate high strength particle reinforced aluminum matrix composites, and a pioneer 6061 matrix alloy was fabricated utilizing PTF to investigate its solution treatment behaviors. A comparison study with traditional permanent mold cast (PMC) 6061 alloy disclosed that PTF alloy showed significantly reduced pore amount with only 0.16% (3.50% for PMC alloy). During solution treatment, PTF alloy displayed a much quicker solutionization progress than PMC alloy because of coarse eutectic phases and primary dendrites in latter alloy, its peak values of 14.5%, 241 MPa and 195 MPa in elongation, ultimate tensile strength and yield strength were achieved at 560ºC, an enhancement of 81.3%, 33.9% and 97.0%, respectively, compared with as-fabricated alloy. The dissolution of eutectic phases plays a dominative role in the growth of the primary α phases and secondarily primary α phases within 535ºC. However, the coarsening after 535ºC is subject to a mixture model involving atom diffusion along grain boundaries and through the crystal lattice. The superior tensile strengths of PTF alloy than PMC alloy resulted from decreased grain size, enhanced solid solution strengthening, reduced porosities and decreased harmful effect of insoluble phases in PTF alloy.

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Section: Influence Of Solution Temperature On Microstructuresupporting

confidence: 66%

Section: Influence Of Solution Temperature On Tensile Propertiesmentioning

confidence: 90%

Section: Influence Of Solution Temperature On Microstructurementioning

confidence: 99%

Section: Influence Of Solution Temperature On Microstructurementioning

confidence: 99%

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Solution Treatment Behaviors of 6061 Aluminum Alloy Prepared by Powder Thixoforming

Zhang

Chen

2018

Mat. Res.

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“…In thixoforming process, semisolid billet obtained via solidifying semisolid slurries undergoes reheating and forming. SSP has shown an apparent advantage in dispersing the ceramic reinforcements of composite [18,19]. It was illustrated that SSP was suitable for fabricating PRAMC [20,21].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Nano-Sized SiCp/7075 Composite Parts Formed by Semisolid Processing

Jiang

Xiao²,

Wang³

et al. 2018

Metals

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Abstract:The tribological behavior of the rheoformed and thixoformed nano-sized SiC p /7075 composite parts is investigated. The semisolid stirring temperature has a little influence on the friction coefficient and wear resistance of the rheoformed composite parts. As for the thixoformed composite parts, the average value of the steady-state coefficient of friction increases firstly and then decreases with increasing reheating temperature. Higher wear resistance is achieved at a reheating temperature of 580 • C. The average value of the steady-state friction coefficient of the rheoformed composite parts varies from 0.37 to 0.45 upon applied loads of from 20 to 50 N. Weight loss increases slightly upon an increase of applied load from 20 to 40 N. An applied load of 50 N leads to a significant increase of the weight loss. The wear rate decreases firstly and then increases with increasing applied load. As for the thixoformed composite part, the average value of the steady-state friction coefficient and the weight loss decreased with an increasing applied load. However, the wear rate decreases firstly with increasing applied load and then increases. As for the rheoformed composite part, the average value of the steady-state friction coefficient decreases firstly and then increases a little with increasing sliding velocity. Weight loss and wear rate show a first increase and a followed decrease with increasing sliding velocity. As for the thixoformed composite part, the average value of the steady-state friction coefficient shows a decrease with increasing sliding velocity. Weight loss and wear rate exhibit, at first, an increase, and then a decrease with increasing sliding velocity. The average friction coefficient varies from 0.4 to 0.44 with increasing volume fraction of SiC. Weight loss and wear rate decrease with increasing volume fraction of SiC. An increase in dislocation density around the nano-sized SiC particles and the mismatch of the coefficient of thermal expansion (CTE) between 7075 matrix and nano-sized SiC particles during solidification improve the wear resistance of the composite. The dominant wear mechanisms of the rheoformed and thixoformed composite parts are adhesive wear, abrasive wear and delamination wear.

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Effects of mould temperature on microstructure and tensile properties of thixoforged Mg 2 Si p /AM60B in-situ composites

Zhang

Chen

Cheng

et al. 2016

Journal of Alloys and Compounds

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Effects of solution treatment on microstructure and mechanical properties of thixoformed Mg2Sip/AM60B composite

Cited by 16 publications

References 32 publications

Solution Treatment Behaviors of 6061 Aluminum Alloy Prepared by Powder Thixoforming

Solution Treatment Behaviors of 6061 Aluminum Alloy Prepared by Powder Thixoforming

Tribological Behavior of Nano-Sized SiCp/7075 Composite Parts Formed by Semisolid Processing

Effects of mould temperature on microstructure and tensile properties of thixoforged Mg 2 Si p /AM60B in-situ composites

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