Microstructure and mechanical properties of TiNbFeCoAl alloys prepared by semi-solid sintering assisted by thermo-mechanical field

Mg-Zn-Y alloys containing a thermally stable icosahedral quasicrystal phase (I-phase) will have wide application future on condition that primary α-Mg dendrite and the I-phase can be refined during the casting process. In this research, the microstructure and mechanical properties of the rheo-squeeze casting (RSC) Mg-6Zn-1.4Y alloys have been investigated. The Mg alloy melt was exposed to ultrasonic vibration (USV) with different acoustic power densities from 0 W/mL to 9 W/mL, and then the slurry was formed by squeeze casting. The results show that good semi-solid slurry with fine and spherical α-Mg particles could be obtained with the acoustic power density of 6 W/mL, and the average grain size and shape factor of primary α-Mg were 32 μm and 0.76, respectively. Meanwhile the coarse eutectic I-phase (Mg3Zn6Y) was refined obviously and dispersed uniformly. Compared with the samples without USV, the tensile strength and elongation of the RSC casting samples with 6 W/mL acoustic power density were elevated by 10.6% and 55.5%, respectively.

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Effect of semi-solid processing on solidification microstructure and mechanical properties of gray cast iron

Materials Science and Engineering A ◽

10.1016/j.msea.2005.10.054 ◽

2006 ◽

Vol 417 (1-2) ◽

pp. 166-173 ◽

Cited By ~ 39

Author(s):

Mohamed Ramadan ◽

Mitsuharu Takita ◽

Hiroyuki Nomura

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Gray Cast Iron ◽

Solidification Microstructure ◽

Gray Cast ◽

Microstructure And Mechanical Properties ◽

Semi Solid

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Microstructure and mechanical properties of micro-SiCp particles reinforced magnesium matrix composites with semi-solid stir casting method

10.1063/1.4968292 ◽

2017 ◽

Author(s):

E. I. Bhiftime ◽

J. B. Belo

Keyword(s):

Mechanical Properties ◽

Stir Casting ◽

Matrix Composites ◽

Casting Method ◽

Magnesium Matrix ◽

Magnesium Matrix Composites ◽

Microstructure And Mechanical Properties ◽

Semi Solid

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Investigation of Microstructure and Mechanical Properties of Semi-Solid State Joining of SSM Aluminum Alloys

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.496-500.371 ◽

2014 ◽

Vol 496-500 ◽

pp. 371-375 ◽

Cited By ~ 1

Author(s):

Apirit Petkhwan ◽

Prapas Muangjunburee ◽

Jessada Wannasin

Keyword(s):

Mechanical Properties ◽

Solid State ◽

Weld Metal ◽

Butt Joint ◽

A356 Aluminum Alloy ◽

Globular Microstructure ◽

Microstructure And Mechanical Properties ◽

A356 Aluminum ◽

Semi Solid ◽

Solid State Joining

In this research, the semi-solid state joining of SSM A356 aluminum alloy was investigated. The butt-joint of SSM A356 was heated by an induction heating coil to create a localized semisolid pool. Then a stirrer was applied into the joint seam in order to mix the weld metal. The accurate controlling of temperature during joining was measured. The effects of stirring rate on physical, macrostructure, microstructure and mechanical properties were studied. Experimental results showed that increase in stirring rates, the surface of the joint was smooth. The weld metal consisted of the globular microstructure and also voids. The density of weld metal zone increased by an appropriate stirring. The best tensile strength was achieved with 1750 rpm, 70 mm/min for 103.4 MPa.

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Comparison of Microstructure and Mechanical Properties of Semi-Solid Castings Produced Using Billets Made by EMS and SEED

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.217-218.332 ◽

2014 ◽

Vol 217-218 ◽

pp. 332-339 ◽

Cited By ~ 4

Author(s):

Xiao Kang Liang ◽

Da Quan Li ◽

Pascal Côté ◽

Stephen P. Midson ◽

Qiang Zhu

Keyword(s):

Mechanical Properties ◽

Cross Section ◽

Dendritic Structure ◽

Casting Process ◽

Grain Structure ◽

High Quality ◽

Microstructure And Mechanical Properties ◽

Grain Structures ◽

Heat Treated ◽

Semi Solid

The spheroidal grains in billets used for semi-solid casting are generally manufactured by electromagnetic stirring (EMS) during the casting process. This method however, is not economically applicable for small quantities of the thixo billets. Swirled Enthalpy Equilibration Device (SEED) has been developed as a rheocasting process, and the SEED process is of interest for developing new thixo alloys, as well as for optimizing the thixocasting processes for high quality components. The objective of this paper is to compare the microstructure and mechanical properties of aluminum alloy 319s billets and castings produced using EMS and SEED feed materials. The experimental results show that for as-cast billets made from SEED process, a well-developed spheroidal grain structure is distributed throughout the cross-section of the billet, while for as-cast EMS billets, the grain structure is inhomogeneous, i.e., a dendritic structure was present adjacent to the surface of the billet, while a uniform, spheroidal structure was present at the centre. After the thixocasting process, however, the both SEED and EMS billets have well-developed, spheroidal grain structures. Mechanical properties of thixocast and T61 heat treated components are comparable for the both SEED and EMS billets.

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Effects of Pulsed Magnetic Field on the Microstructure and Mechanical Properties of Mg97Y2Zn1 Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.123 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 123-126 ◽

Cited By ~ 1

Author(s):

Jian Yin ◽

Xiu Jun Ma ◽

Jun Ping Yao ◽

Zhi Jian Zhou

Keyword(s):

Magnetic Field ◽

Mechanical Properties ◽

Grain Size ◽

Volume Fraction ◽

Pulsed Magnetic Field ◽

Second Phase ◽

Microstructure And Mechanical Properties ◽

Magnetic Field Treatment ◽

Semi Solid ◽

Strength And Plasticity

Effect of pulsed magnetic field treatment on the microstructure and mechanical properties of Mg97Y2Zn1 alloy has been investigated. When the pulsed magnetic field is applied on the alloy in semi-solid state, the α-Mg was modified from developed dendrite to fine rosette, resulting in a refined solidification microstructure with the grain size decreased from 4 mm to 0.5 mm. The volume fraction of the second phase ( X phase) increased by about 10 %. The yield strength, fracture strength and plasticity were improved by 21 MPa, 38 MPa and 2.4 %, respectively. The improvement of mechanical properties was attributed to the refined grain size and increased volume fraction of X phase.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.1768 ◽

2010 ◽

Vol 150-151 ◽

pp. 1768-1771 ◽

Cited By ~ 1

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.

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Effects of Electromagnetic Stirring Frequency on the Microstructure and Mechanical Properties of Al-7Si-0.42 Mg-0.1Cu Alloy by Semi-Solid Processing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.104 ◽

2017 ◽

Vol 898 ◽

pp. 104-110 ◽

Cited By ~ 2

Author(s):

Peng Qi ◽

Bo Long Li ◽

Wen Jian Lv ◽

Tong Bo Wang ◽

Zuo Ren Nie

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Low Temperature ◽

Fracture Morphology ◽

Electromagnetic Stirring ◽

Spherical Morphology ◽

Microstructure And Mechanical Properties ◽

Microstructures And Mechanical Properties ◽

Semi Solid ◽

Dendritic Structures

The effect of the different electromagnetic stirring frequency after low temperature pouring on microstructures and mechanical properties of Al-7Si-0.42 Mg-0.1Cu alloys was studied. It was found that the primary α-Al becomes smaller and tended to be spherical morphology, and the particles were uniformly distributed after electromagnetic stirring. The tensile strength of alloys improved gradually from 193.02 MPa to 212.54 MPa, and the elongation increased from 3.73% to 6.67% when the stirring frequency was 10 Hz. From the fracture morphology, the fracture for alloy stirred at frequency of 10 Hz showed more dimples than that without stirring. When the stirring frequency increased to 15 Hz, the microstructures of primary α-Al appeared to be dendritic structures, and the grains became coarse. As a result, the 10 Hz was the best electromagnetic stirring frequency.

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