Semisolid processing of metallic materials

Atkinson, Helen V.

doi:10.1179/026708310x12815992418012

Cited by 70 publications

(36 citation statements)

References 69 publications

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“…11) Thixoforming, a relatively new metal-forming technology, can significantly improve the mechanical properties of aluminium alloys by decreasing or even eliminating porosity and gas pores, and a large number of thixoformed aluminumalloy components have been used in automobiles. 11,12) In addition, thixoformed components can be heat treated to further improve their mechanical properties. In theory, thixoforming will also be a good way to improve the mechanical properties of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Reheating Temperature and Time on the Microstructure and Mechanical Properties of Thixoforged ZW21 Alloy

Chen

Guo

et al. 2015

Mater. Trans.

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The effects of reheating temperature and time on the microstructure and mechanical properties of thixoforged ZW21 alloy were investigated. The results indicate that the ZW21 alloy is suitable for thixoforming in view of its thixoformability and the resulting mechanical properties. The reheating temperature and duration mainly affect the microstructure, including the size and fraction of primary particles, the microstructure compactness, the solubilities of the solute elements and W phase content, and thus the mechanical properties of the thixoforged alloy. The effects of the reheating temperature are larger than that of the reheating time. These two parameters have an optimum critical value, and values less than or higher than this value decrease the mechanical properties. The appropriate reheating technique is heating for 70 min at 913 K, and the resulting ultimate tensile strength, elongation, and hardness can be up to 238 MPa, 19.4%, and 58 HV, respectively. As the reheating temperature or reheating time increases, the fracture regime has a tendency to change from intergranular mode to transgranular mode and finally to intergranular mode again.

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Section: Introductionmentioning

confidence: 99%

Effects of Reheating Temperature and Time on the Microstructure and Mechanical Properties of Thixoforged ZW21 Alloy

Chen

Guo

et al. 2015

Mater. Trans.

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“…The facture surface morphologies also show this manner: some large-sized pores always exist in the surface of the alloy formed under short heating duration (Figure 13a), and their size gradually decreases as the duration extends and even no obvious pores can be found when the time is prolonged to 130 minutes ( Figure 8b); after that, the pores can be clearly seen again (Figure 13b). It is known that the most important advantage of thixocasting, i.e., reduction of shrinkage porosities and gas pores, can not be enough played until the semisolid slurry has a given relatively high solid fraction (0.4-0.6) 3,4 . If the fraction is too low, gas pores can easily form because of intensive turbulent flow, but when the fraction is too high, cold shuts or large-sized pores can form due to insufficient filling.…”

Section: Effect Of Reheating Timementioning

confidence: 99%

“…However, the mechanical properties of most of them are relatively low compared with those of another family of light alloys, aluminium alloys, and can not match the requirements in many applications. It is well known that thixoforming, a relatively new metal forming technology, can significantly improve mechanical properties of aluminium alloys and a large number of thixoformed aluminum alloy components has been applied to automobiles 3,4 . So it is theoretically expected that thixoforming should be a promising way to improve the mechanical properties of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the application of thixoforming on magnesium alloys is quite late compared with aluminum alloys and only one technique named thixomoulding has been commercially used 4 . It is surprised that the elongation of thixomoulded AZ91D magnesium alloy is obviously improved while its ultimate tensile strength is equivalent to or less than that of the traditional die casting or permanent mould casting alloy 5 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of processing parameters on microstructure and ultimate tensile strength of thixoformed AM60B magnesium alloy

Chen

Wang

et al. 2012

Mat. Res.

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The effects of processing parameters, such as the punch speed, reheating duration and reheating temperature, on microstructure and ultimate tensile strength (UTS) of thixoformed AM60B magnesium alloy have been investigated. The results indicate that low punch speed, short reheating duration or low reheating temperature often produces the defect of cold shuts or shrinkage porosities. On the contrary, gas pores can easily form. In addition, the reheating duration or temperature also has obvious effects on the primary particle size, fraction and morphology. The three parameters can significantly affect the UTS due to their effects on the formation of pores (cold shuts, shrinkage porosities and gas pores). But they can not alter the fracture path during tensile testing and the path is always along the secondarily solidified structures between the primary particles. The effect of pore amount on the UTS is lager than that of the primary particle size, fraction or morphology. In view of their effects on the microstructure compactness and the resultant UTS, the optimized parameters are reheating for 130 minutes at 610 °C and punch speed of 3 m/s.

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“…e minimum fracture elongation of 15% demanded by automotive industry in safetycritical parts is hard to be achieved by die casting [13]. ere-fore, the automotive industry highly needs thixoforming because it can improve the elongation as well as the mechanical properties of the materials used in automobiles [14]. is paper is divided into four sections.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Semisolid Processing of Aluminium Alloys

Salleh

Omar

Syarif

et al. 2013

ISRN Materials Science

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Semisolid metal processing (SSM) or thixoforming is a new technology that offers several advantages over liquid processing and solid processing. is process utilizes semisolid behavior as well as reduces macrosegregation, porosity, and forming forces during shaping process. A lot of research work has been carried out by various researchers in order to exploit the potential of this process to produce different products especially for automotive industry. is paper will summarise the rheological behavior of aluminium alloys in semisolid slurries, thixoformability of modi�ed aluminium alloys, the effect of feedstock production method on mechanical properties, and the importance of developing low-cost raw materials for semisolid processing.

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Semisolid processing of metallic materials

Cited by 70 publications

References 69 publications

Effects of Reheating Temperature and Time on the Microstructure and Mechanical Properties of Thixoforged ZW21 Alloy

Effects of Reheating Temperature and Time on the Microstructure and Mechanical Properties of Thixoforged ZW21 Alloy

Effects of processing parameters on microstructure and ultimate tensile strength of thixoformed AM60B magnesium alloy

An Overview of Semisolid Processing of Aluminium Alloys

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