Effects of Heat Treatment on Microstructure and Mechanical Properties of Mg-3Sn-2Ca Magnesium Alloy

2012 ◽  
Vol 548 ◽  
pp. 315-320
Author(s):  
Ming Bo Yang ◽  
Ting Zhang Guo ◽  
Hui Li ◽  
Hong Jun Hu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Magnesium Alloy ◽  
Aging Time ◽  
Aging Temperature ◽  
Creep Properties ◽  
Beneficial Effects ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Matrix Hardness

The effects of heat treatment on the microstructure and mechanical properties of Mg-3Sn-2Ca alloy were investigated. The results indicate that after solutionized at 500 °C for more than 24 h, the morphology of the CaMgSn phase in the alloy changes from the continuous and/or quasi-continuous nets to the particle-like shape. Furthermore, after solutionized at 500 °C for 24 h, for a given aging temperature of 285 °C, with prolonging aging time the matrix hardness of the alloy increases, and attains the maximum at 32 h of aging time and beyond that it decreases. In addition, it is preliminarily inferred that heat treatment would give a beneficial effects on the tensile and creep properties of Mg-3Sn-2Ca alloy due to the modification of the CaMgSn phase.

Effects of Sb Addition on Heat-Treated Microstructure and Mechanical Properties of AZ61-0.7Si Magnesium Alloy

2012 ◽  
Vol 190-191 ◽  
pp. 1306-1310 ◽  
Author(s):  
Ming Bo Yang ◽  
Hong Liang Li ◽  
Ren Ju Cheng ◽  
Hong Jun Hu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Magnesium Alloy ◽  
Solution Heat Treatment ◽  
Cast Alloy ◽  
Chinese Script ◽  
Creep Properties ◽  
Mg2si Phase ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated

In this paper, the effects of Sb addition on heat-treated microstructure and mechanical properties of AZ61-0.7Si magnesium alloy were investigated. The results indicate that the solution heat treatment can modify the Chinese script shaped Mg2Si phase in the AZ61-0.7Si alloy. After solutionized at 420°C, the morphology of the Mg2Si phase in the AZ61-0.7Si alloy changes from the Chinese script shape to the short pole and block shapes, and the higher modification efficiency could be obtained for the alloy with the addition of 0.4 wt.%Sb. In addition, the effect of the solution heat treatment on the morphology of the Mg2Si phase can also result in the improvement of tensile and creep properties for the AZ61-0.7Si alloy. After solutionized at 420°C for 24h and followed by aging treatment at 200°C for 12h, the AZ61-0.7Si alloy exhibits higher tensile and creep properties than that of the as-cast alloy, and the properties improvement resulted from heat treatment, is more obvious for the AZ61-0.7Si alloy with the addition of 0.4 wt.%Sb.

scholarly journals Effect of Trace Yttrium Addition and Heat Treatment on the Microstructure and Mechanical Properties of As-Cast ADC12 Aluminum Alloy

2018 ◽  
Vol 9 (1) ◽  
pp. 53 ◽  
Author(s):  
Jianlong Liu ◽  
Qingjie Wu ◽  
Hong Yan ◽  
Songgen Zhong ◽  
Zhixiang Huang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloy ◽  
Primary Si ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition ◽  
The Matrix ◽  
The Mean ◽  
Average Size ◽  
Small Average Size

The effects of rare earth yttrium (Y) additions and the heat treatment process on the microstructure and mechanical properties of as-cast ADC12 aluminum alloy have been investigated. The results showed that the primary Si crystals were significantly refined from long axis to fibrous or granular when the Y content was 0.2 wt%. Compared to the matrix, the mean area and aspect ratio were decreased by 92% and 75%, respectively. Moreover, the Si and Fe-rich phases were spheroidized and refined with a small average size during the solid solution. It was also noted that the copper-rich phases were dissolved into the matrix. Correspondingly, it was found that after metamorphic and heat treatment the ultimate tensile strength (UTS), elongation, and, hardness increased by 81.9%, 69.7%, and 74.8%, respectively, compared to the matrix. The improved mechanical properties can primarily be attributed to the optimization of the microstructure and the refinement of various phases.

scholarly journals Evolution in Microstructure and Mechanical Properties of Inconel 783 Alloy Bolts after Long Term High-Temperature Aging at 700 °C

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1440 ◽  
Author(s):  
Peng Duan ◽  
Zongde Liu ◽  
Shuchao Gu ◽  
Song Wang
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Aging Time ◽  
Aging Temperature ◽  
Testing Machine ◽  
Impact Testing ◽  
Rapid Decline ◽  
Β Phase ◽  
Microstructure And Mechanical Properties ◽  
Orientation Distributions

This paper described systematically the changes in microstructure and mechanical properties of Inconel 783 alloy after a considerably long time (equivalently 55,000 h, about 76.4 months) of thermal exposure. Based on the Inconel 783 alloy bolts of an intermediate pressure main stop valve used in a 1000 MW ultra-supercritical unit, the evolution of microstructures and mechanical properties were studied after 700 °C aging temperature with different aging times (1000 h, 3000 h and 20,000 h, corresponding to about 1.4 months, 4.2 months and 27.8 months, respectively), using an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD), a universal tensile testing machine and impact testing machine. The results indicated that the bolts aged for 1000 h in two temperatures, showing the second needle β phase, of which the quantity and size obviously increased with aging time. Meanwhile, the characteristics in quantity and shape of the primary β phase changed obviously with the aging time, which transformed to strip the Ni5Al3 and Laves-Nb-rich brittle phase in the matrix after aging for 20,000 h. The size of the γ’ phase grew bigger with aging time, and orientation distributions have been observed obviously at 3000 h aging in 700 °C. Compared with the 650 °C aging temperature, the coarsening of γ’ precipitates and second needle β, the orientation distributions of γ’ were more obvious at the 700 °C aging temperature with aging time, which resulted in the rapid decline in yield strength and tensile strength and obvious increase in the brittleness for Inconel 783 alloy bolts.

Effect of Aging Temperature on Microstructure and Mechanical Properties of AZ81-4%Gd Magnesium Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 301-306
Author(s):  
Quan Ying Guo ◽  
Zheng Liu ◽  
Ping Li Mao ◽  
Jing Sun
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Aging Temperature ◽  
Energy Dispersive Spectrometer ◽  
Alloy Sheet ◽  
Precipitation Pattern ◽  
Continuous Precipitation ◽  
Hardness Tester ◽  
Microstructure And Mechanical Properties ◽  
Alloy Hardness

The microstructure and mechanical properties of AZ81-4%Gd magnesium alloy sheet after aging at 150, 200, 250, 300 were analyzed and tested by x-ray diffraction,scanning electron microscope,energy dispersive spectrometer and hardness tester. The results demonstrated that β-Mg17Al12 phases were precipitated in two patterns, those were continuous precipitation and discontinuous precipitation during aging below 250 and the morphology of β-Mg17Al12 phase was different. The β-Mg17Al12 phases were precipitated in the pattern of continuous during aging at 300. The analysis showed that the precipitation pattern and morphology of β phases were related to the mechanism of nucleation and growth. The alloy hardness achieved the highest value after aging at 250 and 300 for 24 hours, the hardness of the alloy was the highest after aging at 150 and 200 for 32 hours. In addition, the observations on microstructure and the testing on hardness revealed that the best aging temperature is 200 for the AZ81-4%Gd alloys within the scope of the study.

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