Morphological Features of Silicon Rich Phase in Powder Thixoformed Spray Atomized Hyper-Eutectic Al-Si Alloy

2008 ◽  
Vol 141-143 ◽  
pp. 493-498
Author(s):  
M. Kiani ◽  
Hossein Aashuri ◽  
S. Nategh ◽  
A. Foroughi ◽  
A. Narimannezhad ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Rapid Solidification ◽  
Microstructural Evolution ◽  
Final Stage ◽  
Morphological Features ◽  
Rich Phase ◽  
Powder Particles ◽  
Semi Solid ◽  
Silicon Particles

Microstructural evolution of the spray atomized and powder thixoformed hyper-eutectic A390 aluminum alloy was investigated. The spray atomized powder revealed homogeneous and very fine silicon particles distribution, due to the rapid solidification of the alloy. The semi-solid powders were extruded into a closed die cavity through a hole for the plastic deformation of the powder particles. A drop forge of 45kg weight at different heights was used in this investigation. Remarkable rearrangement and growth of the silicon rich phase was revealed in the final stage.

Microstructure evolution and plastic deformation of Ni47Co53 alloy under tension

CrystEngComm ◽  
2022 ◽  
Author(s):  
ruibo ma ◽  
Lili Zhou ◽  
Yong-Chao Liang ◽  
Ze-an Tian ◽  
Yun-Fei Mo ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Rapid Solidification ◽  
Microstructural Evolution ◽  
Microstructure Evolution ◽  
Cooling Rates ◽  
Solidification Processes ◽  
Molecular Dynamics Methods

To investigate microstructural evolution and plastic deformation under tension conditions, the rapid solidification processes of Ni47Co53 alloy are first simulated by molecular dynamics methods at cooling rates of 1011, 1012...

Development of Unconventional Processing of Steels in Semi-Solid State

2016 ◽  
Vol 256 ◽  
pp. 251-256
Author(s):  
Bohuslav Mašek ◽  
David Aišman ◽  
Filip Vančura ◽  
Martin F.X. Wagner ◽  
Hana Jirková ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Solid State ◽  
Severe Plastic Deformation ◽  
Rapid Solidification ◽  
Process Conditions ◽  
In Situ Observation ◽  
Semi Solid

This paper describes selected capabilities of unconventional processing of steels in semi-solid state under various process conditions and with the use of various steel chemistries for obtaining unusual structures formed by rapid solidification in combination with other procedures. This investigation involves the use of severe plastic deformation techniques (SPD) and in-situ observation of the transformation of microstructure from solid state to semi-solid state at temperatures above 1200°C using a high-temperature microscope.

Remelting Technology and Microstructural Evolution of Semi-Solid Al-7Si-2RE Alloy

2010 ◽  
Vol 33 ◽  
pp. 1-5
Author(s):  
Shi Kun Xie ◽  
Rong Xi Yi ◽  
Xiu Yan Guo ◽  
Xiao Liang Pan ◽  
Xiao Qiu Zheng
Keyword(s):  
Aluminum Alloy ◽  
Microstructural Evolution ◽  
Temperature Control ◽  
Liquid Fraction ◽  
Isothermal Holding ◽  
Control Program ◽  
Holding Time ◽  
Α Phase ◽  
Semi Solid ◽  
Equiaxed Grains

In semi-solid remelting process, the various stages of reheating temperature and isothermal holding time must be accurately controlled in order to obtain the uniformly distributed and small equiaxed grains microstructure. In this paper, a temperature control program was developed and the remelting process for Al-7Si-2RE aluminum alloy was carried out. The results showed that with the raise of reheating temperature and the extension of isothermal holding time, the liquid fraction increases, α-phase grain grows and becomes rounding in the process of Al-7Si-2RE alloy semi-solid remelting. The most reasonable process parameter of reheating temperature is at 585~590°C and its appropriate isothermal holding time are about 10~15min for the semi-solid Al-7Si-2RE alloy.

Fabrication of Semisolid Billets of Hypereutectic Al-Si Alloy by Severe Plastic Deformation and Remelting

2012 ◽  
Vol 472-475 ◽  
pp. 323-327 ◽  
Author(s):  
Hai Xia Shi ◽  
De Hong Lu ◽  
Hui Gong ◽  
Rong Zhou
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Friction Stir Processing ◽  
Primary Silicon ◽  
Second Phase ◽  
Rich Phase ◽  
Friction Stir ◽  
Second Phase Particles ◽  
Mean Size ◽  
Silicon Particles

This paper preliminarily explored and proved the feasibility of fabricating semisolid thixoforming billets for a hypereutectic Al-Si alloy (AlSi29Fe3) by severe plastic deformation (SPD) and semisolid remelting. In this paper, friction stir processing (FSP) was used to refine the coarse primary silicon particles and needle-shaped iron-rich phase of the hypereutectic Al-Si alloy. The results show that the semisolid thixoforming billets obtained by the above route contain fine spherical Al grains with mean size of 34m, and second-phase particles (both primary silicon and iron-rich intermetallic) of less than 10m. The microstructure is ideal non-dendritic semisolid structure. Therefore, SPD and remelting is a promising technology for the fabrication of semisolid thixoforming billets of the hypereutectic Al-Si alloy.

Microstructure evolution and mechanical properties of 6N01S-T5 aluminum alloy joints with semi-solid solders by ultrasonic soldering

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940027
Author(s):  
Yao Wang ◽  
Yuanxing Li ◽  
Dengquan Han ◽  
Sifu Qiu ◽  
Hui Chen
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Aluminum Alloy ◽  
Rich Phase ◽  
Soldering Temperature ◽  
Ultrasonic Time ◽  
Ultrasonic Soldering ◽  
Semi Solid ◽  
Lower Temperature ◽  
6N01 Aluminum Alloy

The article investigated the properties of 6N01 aluminum alloy joints with Sn-80Zn semi-solid solders by ultrasonic soldering. It was found that semi-solid solders consisted of Zn-rich phase with short rod-like dentrite, which had the lower solidus temperatures, while Zn-rich phase with long dentritic grains used the conventional solders. The joints soldered with Sn-80Zn conventional filler metal reached maximum shear strength of 73 MPa at the soldering temperature of 390[Formula: see text]C. The joint using Sn-80Zn semi-solid solder obtained higher shear strength of 90 MPa at the lower temperature of 370[Formula: see text]C. The effects of the ultrasonic time and the soldering temperature on the mechanical properties of the joints were also investigated with the Sn-80Zn semi-solid solders.

An Investigation of Mechanical Properties and Microstructural Evolution in an Aluminum Alloy Processed by Severe Plastic Deformation

2014 ◽  
Vol 922 ◽  
pp. 610-615 ◽  
Author(s):  
Shima Sabbaghianrad ◽  
Terence G. Langdon
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Microstructural Evolution ◽  
Vickers Microhardness ◽  
Microstructural Analysis ◽  
Angular Pressing ◽  
Al 7075 ◽  
7075 Alloy

Processing by a combination of equal-channel angular pressing (ECAP) and high-pressuretorsion (HPT) was performed on disks of an Al-7075 alloy. The alloy was annealed at 753 K, processedby ECAP for totals of 4 passes and then processed by HPT under a pressure of 6.0 GPa up to amaximum of 20 turns. Measurements of Vickers microhardness showed reasonable hardnesshomogeneity after processing through 20 turns. It is demonstrated that the results from mechanicaltesting and microstructural analysis are consistent with the hardness measurements.

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