Effects of different processing parameters on the semisolid microstructure of the AZ91D alloy during partial remelting

Wang, J.G.; Lin, Huaqiang; Wang, H.Y.; Jiang, Qi–Chuan

doi:10.1016/j.jallcom.2007.11.030

Cited by 30 publications

(25 citation statements)

References 24 publications

(33 reference statements)

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“…However, coarsening due to coalescence and Ostwald ripening is simultaneously accelerated due to the improved atom diffusion ability. 13) Thus, the primary particle size only decreases slightly when the temperature increases from 898 K to 913 K and then increases slightly. Similarly, the coarsening of the entrapped liquid pools driven by the decreasing solid/ liquid interface energy is also accelerated.…”

Section: ¹1mentioning

confidence: 90%

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: ¹1mentioning

confidence: 90%

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 AZ91D was chosen because it has certain wroughtability in addition to its excellent castability, is easier to process than purer alloys, and has been widely studied in semisolid processing. [16][17][18][19][20][21][22] Besides, there is a niche market for AZ91 magnesium alloy welding rods, which are difficult to produce using conventional processes.…”

Section: Since the Discovery Of The Semisolid Metal (Ssm)mentioning

confidence: 99%

Continuous Twin Screw Rheo-Extrusion of an AZ91D Magnesium Alloy

Xia

Huang

Cassinath

et al. 2012

Metall Mater Trans A

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The twin screw rheo-extrusion (TSRE) is designed to take advantage of the nondendritc microstructure and thixotropic characterization of semisolid-metal slurries and produce simple metal profiles directly from melts. The extrusion equipment consists of a rotor-stator high shear slurry maker, a twin screw extruder, and a die assembly. The process is continuous and has a potential for significantly saving energy, manufacturing cost, and enhancing efficiency. The present investigation was carried out to study the process performance for processing rods of an AZ91D magnesium alloy and the microstructure evolution during processing. The semisolid slurry prepared by the process was characterized by uniformly distributed nondendritic granular primary phase particles. AZ91D rods with uniform and fine microstructures and moderate mechanical properties were produced. For the given slurry making parameters, decreasing extrusion temperature was found to improve microstructures and properties. The mechanisms of particle granulation and refinement and the effect of processing parameters on process performance and thermal management are discussed.

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“…To clarify this problem, the relations between processing parameters, resultant microstructure and mechanical properties should be studied. But most of the existing investigations have focused on the formation of semisolid non-dendrititic microstructures [6][7][8][9][10] . Only a few papers have involved the microstructures and mechanical properties of thixoformed magnesium alloys under a given set of processing parameters 11,12 .…”

Section: Introductionmentioning

confidence: 99%

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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Effects of different processing parameters on the semisolid microstructure of the AZ91D alloy during partial remelting

Cited by 30 publications

References 24 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

Continuous Twin Screw Rheo-Extrusion of an AZ91D Magnesium Alloy

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

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