The Influence of Stirring Time on Mechanical Properties of Sn–58Bi Alloy Treated in the Semi-Solid State by Mechanical Stirring Process

2011 ◽  
Vol 480-481 ◽  
pp. 1521-1524 ◽  
Author(s):  
Yong Jun Hu ◽  
Yong Li ◽  
Jian Nan He ◽  
Xiao Ling Cheng ◽  
Feng Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
Solidification Process ◽  
Eutectic Structure ◽  
Lamellar Eutectic ◽  
Mechanical Stirring ◽  
Plate Shape ◽  
Stirring Time ◽  
Semi Solid ◽  
Lamellar Eutectic Structure

In this paper, the technology of semi-solid casting was to used are produced Sn-Bi alloy. The influence of agitating time at 125 °C on the microstructure and mechanical properties of of Sn-58Bi casting alloy were discussed. The eutectic Sn-Bi alloy was mechanically agitated during the casting solidification process. The results indicated that non-lamellar Sn-Bi structure with long plate shape, short strip, small size block and suborbicular block shape Sn phase was obtained for different stirring time. The elongation of Sn-Bi alloy with non-lamellar eutectic structure is improved prominently. Compared with the elongation of lamellar eutectic Sn-Bi alloy prepared by conventional die casting, the elongation of semi-solid Sn-Bi alloy with suborbicular block shape Sn phase is enhanced up to 45%.

Microstucture and Mechanical Properties of Semi-Solid Sn–58Bi Alloy

2011 ◽  
Vol 480-481 ◽  
pp. 687-690 ◽  
Author(s):  
Yong Jun Hu ◽  
Bin Qiang Zhong ◽  
Feng Li ◽  
Xiao Ling Cheng ◽  
Xiao Ting Xiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solidification Process ◽  
Eutectic Structure ◽  
Effect Of Temperature ◽  
Casting Method ◽  
Mechanical Agitation ◽  
Mechanical Stirring ◽  
Plate Shape ◽  
Alloy Microstructure ◽  
Semi Solid

Preparation of semi-solid Sn–58Bi alloys by mechanical stirring casting method was investigated. The effect of temperature below the melting temperature on the microstructures and mechanical properties of semi-solid Sn–58Bi alloys was discussed. The experimental results showed that long plate shape, block shape and suborbicular Sn phases were formed by mechanical agitation during the casting solidification process. The non-lamellar Sn-Bi Microstructure improves prominently the elongation of Sn-Bi alloy. The elongation of semi-solid Sn-Bi alloy with suborbicular Sn phase is enhanced up to 37% compared with the elongation of lamellar eutectic Sn-Bi alloy prepared by conventional die casting. After the agigation above 130 °C, non-lamellar Sn-Bi eutectic structure is formed and lamellar Sn-Bi eutectic precipitates. When the agitating temperature was 135 °C, the elongation of semi-solid Sn-Bi alloy mixed with non-lamellar and lamellar Sn-Bi alloy microstructure is enhanced up to 24%.

Microstructure and Mechanical Properties of Sn-Bi Alloy Treated in the Semi-Solid State by Mechanical Stirring Process

2010 ◽  
Vol 150-151 ◽  
pp. 1768-1771 ◽  
Author(s):  
Feng Li ◽  
Yong Jun Hu ◽  
Xiao Ling Cheng ◽  
Xiao Ting Xiao
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Die Casting ◽  
Percentage Elongation ◽  
Mechanical Stirring ◽  
Microstructure And Mechanical Properties ◽  
Stirring Time ◽  
Microstructures And Mechanical Properties ◽  
Semi Solid

In this work, the effect of stirring time on the solidifed microstructures and mechanical properties of semi-solid Sn-Bi slurry was investigated by the mechanical stirring method. The results indicated that a fine round granular solidifed structure of Sn-Bi semi-solid slurry was obtained at 142 and stirred for 8 min. Compared with the Sn-Bi alloy prepared conventional die casting, the mechamical properties of semi-solid Sn-Bi alloy was improved prominently. The percentage elongation of semi-solid Sn-Bi alloy was increased 67 % compared with that of the Sn-Bi alloy prepared conventional die casting.

Effects of Hot Extrusion on Microstructure, Texture and Mechanical Properties of Mg-5Li-3Al-2Zn Alloy

2013 ◽  
Vol 773-774 ◽  
pp. 218-225
Author(s):  
Le Gan Hou ◽  
Rui Zhi Wu ◽  
Ji Qing Li ◽  
Jing Huai Zhang ◽  
Mi Lin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Grain Refinement ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Eutectic Structure ◽  
Basal Texture ◽  
Lamellar Eutectic ◽  
Lamellar Eutectic Structure

This work mainly studied the effects of hot extrusion on microstructure, texture and mechanical properties of Mg-5Li-3Al-2Zn alloy. The results show that the microstructures of as-cast and as-extruded alloys both consist of α-Mg matrix and lamellar eutectic structure (α-Mg and AlLi phases). During the hot extrusion, the large eutectic structure of as-cast alloy was crushed into small eutectic structure and the grains were effectively refined. A {0002} basal texture was formed after hot extrusion. The as-extruded alloy exhibits remarkably improved tensile properties, which is mainly attributed to the grain refinement and the formation of texture.

scholarly journals Designing ultrafine lamellar eutectic structure in bimodal titanium alloys by semi-solid sintering

2017 ◽  
Vol 702 ◽  
pp. 51-59 ◽  
Author(s):  
L.M. Kang ◽  
C. Yang ◽  
F. Wang ◽  
X.X. Li ◽  
D.Z. Zhu ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Eutectic Structure ◽  
Lamellar Eutectic ◽  
Semi Solid ◽  
Lamellar Eutectic Structure

Bimodal titanium alloys with ultrafine lamellar eutectic structure fabricated by semi-solid sintering

2017 ◽  
Vol 132 ◽  
pp. 491-502 ◽  
Author(s):  
C. Yang ◽  
L.M. Kang ◽  
X.X. Li ◽  
W.W. Zhang ◽  
D.T. Zhang ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Eutectic Structure ◽  
Lamellar Eutectic ◽  
Semi Solid ◽  
Lamellar Eutectic Structure

Behavior of A356 Alloy in Semi-Solid State Produced by Mechanical Stirring

2011 ◽  
Vol 402 ◽  
pp. 331-336 ◽  
Author(s):  
Salman Nourouzi ◽  
Amin Kolahdooz ◽  
Mohammad Botkan
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
A356 Alloy ◽  
Mold Temperature ◽  
A356 Aluminum Alloy ◽  
Micro Structure ◽  
Mechanical Stirring ◽  
Aluminum Silicon Alloy ◽  
A356 Aluminum ◽  
Semi Solid

This investigation studied semi-solid (SSM) aluminum-silicon alloy produced by mechanical stirring. Aluminum alloys produced by this method, are widely used instead of conventional die casting and forging processes. In this research by using a mechanical stirrer slurry maker, the effects of stirring speed, the solid fraction percent and mold temperature are investigated on micro-structure and hardness of A356 aluminum alloy in semi-solid casting. By optimizing the forming parameters, dendrite microstructure changes to globular and mechanical properties improves. This is because of breaking and globularizing dendrites of primary α-AL phase. It is determined that stirring temperature of 608°C and stirring speed of 300 RPM leads to the uniform grains distribution and therefore arrives to better hardness for the produced billets.

Microstructure Evolution and Mechanical Properties of Rheoformed YL112 Aluminum Alloy

2008 ◽  
Vol 141-143 ◽  
pp. 163-168 ◽  
Author(s):  
Xiang Jie Yang ◽  
Hong Min Guo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Shape Factor ◽  
Die Casting ◽  
Equivalent Diameter ◽  
Uniform Microstructure ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum ◽  
Semi Solid ◽  
Secondary Solidification

Rheo-die casting (RDC) based on LSPSF (low superheat pouring with a shear field) rheocasting process has been exploited. In case of secondary die casting aluminum alloy YL112, LSPSF allowed for preparation of sound semi-solid slurry in 15-20s that fully meet the production rate of HPDC, the primary α-Al exhibiting a mean equivalent diameter of 70 μm and shape factor of 0.93, without any entrapped eutectic. Compared to conventional HPDC, RDC improves microstructures in castings. Secondary solidification of semi-solid slurry takes place uniformly throughout the entire cavity, producing an extremely fine and uniform microstructure. The experimental results show the RDC 380 alloy has much improved integrity and mechanical properties, particularly elongation, and heat treatment can be used to enhance the mechanical properties.

Study on Rheo-Diecasting for In Situ Synthesized Mg2Si/AM60 Composites

2011 ◽  
Vol 383-390 ◽  
pp. 707-711
Author(s):  
Hong Yan ◽  
Yong Hu ◽  
Xiao Quan Wu
Keyword(s):  
Die Casting ◽  
Casting Machine ◽  
Chinese Script ◽  
Matrix Composites ◽  
Forming Process ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Mechanical Stirring ◽  
Semi Solid

Magnesium alloys have high specific strength, specific stiffness, excellent thermal conductivity and casting properties, which have a great prospects development in the industry, However, its low plasticity and ductility limited its application. Magnesium matrix composites can effectively improve its performance. Magnesium alloy die-casting is the main forming process, the conventional high-pressure die-casting (HPDC) defects in multi-cavity type, easy to volume gas, non-heat-treated. Compared with HPDC, the rheo-diecasting (RDC) process has been greatly developed for near-net shape components. In this paper, Mg2Si /AM60 composites is fabricated by in-situ synthesis and semi-solid magnesium matrix composites which are rheoformed in the die-casting machine are prepared by mechanical stirring. The results indicate that the microstructure of composites is non-dendritic and Chinese script type Mg2Si are fine distributed. The fundamental morphology of microstructure by HPDC is dendrite and liquid-phase distributed between dendrite irregularly. The RDC samples have close-to-zero porosity, less segregation, the most of semi-solid of microstructure in rheo-diecasting is spherical or as-spherical structure.

Numerical Simulation of Semi-Solid Die Casting of ZA Alloy Automotive Bushing Based on AnyCasting

2013 ◽  
Vol 411-414 ◽  
pp. 3064-3067 ◽  
Author(s):  
Han Wu Liu ◽  
Zhi Ping Zhang ◽  
Yan Fang Luo ◽  
Li Lu
Keyword(s):  
Heat Dissipation ◽  
Die Casting ◽  
Solidification Process ◽  
Casting Process ◽  
Filling Sequence ◽  
Gas Trapping ◽  
Simulation Results ◽  
Stress And Deformation ◽  
Semi Solid ◽  
Solid Liquid

In order to reduce the wear of parts caused by long-term friction, and to reduce the frequency of parts replacement, ZA alloy with low hardness and good wear resistance is chosen to replace the traditional copper alloy as the material to manufacture automotive bushing, and the semi-solid die casting is used. On this basis, the software AnyCasting is used to simulate and analyze the filling and solidification process, the filling sequence, the variation of temperature field, and the part region where defects are prone to occur in the semi-solid process. The simulation results show that under the parameters set in the simulation process, when casting filling rate reached 90%, the metal started to solidify; since the gate place is easy for heat dissipation, when the temperature of the alloy liquid reached its liquidus temperature 595°C, the phenomenon of solid-liquid phase separation appeared at the gate; the defects such as gas trapping, residual stress and deformation would appear both in the place of first filling and the parting surface; when the preheat temperature of the mold was 150°C-200°C,the alloy liquid possesses liquidity. The simulation results offer certain theoretical instruction to optimize the semi-solid casting process of ZA Alloy automotive bushing manufacturing, as well as reducing or avoiding a variety of quality defects arose in the actual casting process.

Study on Microstructures and Mechanical Properties of Rheo-Die Casting Semi-Solid A356 Aluminum Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 453-456 ◽  
Author(s):  
Yong Lin Kang ◽  
Yue Xu ◽  
Zhao Hui Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Die Casting ◽  
A356 Alloy ◽  
Experimental Results ◽  
A356 Aluminum Alloy ◽  
Microstructures And Mechanical Properties ◽  
A356 Aluminum ◽  
Semi Solid

In this paper, with a newly self-developed rotating barrel rheomoulding machine(RBRM), microstructures and mechanical properties of rheo-die casting A356 alloy were studied. In order to clearly show the characteristic of rheo-die casting, liquid die casting and semi-solid casting were done too. The experimental results showed that microstructures of rheo-die casting were composed of solid grains, which were finer and rounder, and had fewer pores. In the three technologies, integrated mechanical properties of semi-solid rheo-die casting were the best.

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