Microstructure and Properties of In Situ Al-Si-Mg2Si Composite Prepared by Melt Superheating

2011 ◽  
Vol 52-54 ◽  
pp. 750-754 ◽  
Author(s):  
Zheng Liu ◽  
Min Xie ◽  
Xiao Mei Liu
Keyword(s):  
Mechanical Properties ◽  
Holding Time ◽  
Mg2si Particle ◽  
Microstructure And Properties ◽  
Average Size

Mg2Si particle reinforced in-situ Al-Si composite is prepared by melt superheating, and the microstructure and properties of the composite are researched. The results indicate that it is feasible that the melt superheating is applied to preparing Mg2Si particle reinforced in-situ Al-Si composite, and the suitable preparing parameters of melt superheating on the alloy are obtained. When the superheating temperature is 860°C and holding time is 25 min, the average size of Mg2Si particle in the alloy will be reduced to 11μm compared with 34μm without melt superheating, and the mechanical properties of the composite is obviously improved.

Hypereutectic Al-Si-Mg In Situ Composite Prepared by Melt Superheating

2011 ◽  
Vol 194-196 ◽  
pp. 113-116 ◽  
Author(s):  
Zheng Liu ◽  
Min Xie
Keyword(s):  
Processing Parameters ◽  
Holding Time ◽  
Mg Alloy ◽  
Mg2si Particle ◽  
Alloy Composite ◽  
Average Size

Mg2Si particle reinforced hypereutectic Al-Si-Mg alloy composite is prepared by melt superheating, and the effects of the main processing parameters, such as superheating temperature and holding time, on the microstructure of the composite are studied. The results indicate that it is feasible to prepare Mg2Si particle reinforced Al-18%Si-Mg alloy composite by melt superheating. The suitable preparing parameters of melt superheating on the alloy are obtained. When the superheating temperature is 860°C and holding time is 25 min, the average size of Mg2Si particle in the alloy will be reduced to about 11μm compared with 34μm without melt superheating.

Effect of Aging Treatment on Mechanical Properties and Electrical Conductivity of Cu-5.7%Cr In Situ Composite Produced by Equal Channel Angular Pressing

2012 ◽  
Vol 560-561 ◽  
pp. 344-348 ◽  
Author(s):  
Wei Wei ◽  
Kun Xia Wei ◽  
Igor V. Alexandrov ◽  
Qing Bo Du ◽  
Jing Hu
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Equal Channel Angular Pressing ◽  
Aging Treatment ◽  
In Situ Composite ◽  
Angular Pressing ◽  
Peak Aging ◽  
Average Size ◽  
Equiaxed Grains

The effect of aging treatment on mechanical properties and electrical conductivity of Cu-5.7%Cr in situ composite produced by equal channel angular pressing (ECAP) was investigated here. The rotation and spreading of Cr particles was observed in Cu-5.7%Cr alloy during the ECAP, resulting in long thin in situ filaments. The equiaxed grains of the Cu phase with an average size of 200 nm were developed after eight passes of ECAP. When aging at 400~450 °C for 1 h, Cu-5.7%Cr composite after ECAP shows the maximum microhardness, and the electrical conductivity is larger than 70% of IACS. At 400 °C, the peak aging time appears for 0.5~2 h, dependent on the pre-strain for all ECAP samples. With the increase of ECAP passes, the enhancement of tensile strength due to the aging treatment declines, and even shows negative after eight passes of ECAP. The combination of ECAP and aging treatment would be a promising process to balance mechanical properties and electrical conductivity of Cu-5.7%Cr composite.

Ti/B4C Composites Prepared by In Situ Reaction Using Inductive Hot Pressing

2017 ◽  
Vol 742 ◽  
pp. 121-128 ◽  
Author(s):  
Enrique Ariza Galván ◽  
Isabel Montealegre-Meléndez ◽  
Cristina Arévalo ◽  
Michael Kitzmantel ◽  
Erich Neubauer
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Manufacturing Process ◽  
Processing Conditions ◽  
Microstructure And Properties ◽  
Microstructure Observation ◽  
Suitable Processing

In the present work, in situ reinforced titanium composites (TMCs) synthesized using inductive hot pressing (iHP) are studied. The effects of B4C phases and applied processing conditions, on the microstructure and properties of TMCs, are investigated. With the addition of B4C particles, the microstructure of TMCs is refined and the strength is improved.Products of reactions which occur during the manufacturing process are analysed in detail. Microstructure observation illustrates, that B4C survives - depending on the processing conditions. The reinforcing phases are homogeneously distributed in Ti matrix. Moreover, results of densification, mechanical properties and hardness measurements help to identify the most suitable processing conditions to produce this kind of TMCs.

Ultrasonic Effect on Refinement of Mg2Si and Mechanical Properties of In Situ Al-Mg-Si Composites

2009 ◽  
Vol 79-82 ◽  
pp. 549-552 ◽  
Author(s):  
Dae Gyun Ko ◽  
Geun Hong Yu ◽  
Jeong Il Youn ◽  
Young Jig Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Irregular Shape ◽  
Ultrasonic Effect ◽  
Primary Mg2si ◽  
New Process ◽  
Average Size

Coarse primary Mg2Si was usually found in Al-Mg-Si alloys. In this experiment, to refine the coarse primary Mg2Si size, ultrasound was used as a new process. Ultrasound was injected to the molten Al-Mg-Si melts directly and its effect was significant. Average size of primary Mg2Si was reduced from 70㎛ to 15㎛, morphology was also changed to polygonal from irregular shape. Moreover tensile strength was improved by 30%, from 112 to 148 after ultrasonic injection.

The Effect of Additives on the Microstructure and Properties of BaTiO3 Ceramics

2013 ◽  
Vol 787 ◽  
pp. 152-156
Author(s):  
A. Lara ◽  
P. Yuan ◽  
F. Ghezzo ◽  
X. Miao ◽  
Z. Zhao
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Relative Density ◽  
Slip Casting ◽  
Holding Time ◽  
Theoretical Density ◽  
Microstructure And Properties ◽  
Conventional Furnace ◽  
Effect Of Additives ◽  
Dielectric And Mechanical Properties

Doped BaTiO3 powders were sintered by slip casting. Sintering was performed at the temperature of 1300oC, for 180 min holding time, in a conventional furnace. Additives were varied to study their effect on the densification and both dielectric and mechanical properties. The relative density of the obtained material was high, up to 96.5 0.6 % the theoretical density for the BaTiO3-Al2O3 composition. For these samples, their mechanical and dielectric properties have been studied.

scholarly journals Composite Zones Produced in Iron Castings by In-Situ Synthesis of Tic Carbides

2013 ◽  
Vol 58 (2) ◽  
pp. 465-471 ◽  
Author(s):  
E. Olejnik ◽  
M. Górny ◽  
T. Tokarski ◽  
B. Grabowska ◽  
A. Kmita ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
In Situ Synthesis ◽  
Gradual Decrease ◽  
Surface Fraction ◽  
Iron Castings ◽  
Surface Content ◽  
Average Size

The study discusses a method of producing composite zones at the edge of castings made of ferritic-pearlitic ductile iron. Composite zones were produced in castings made of ferritic-pearlitic ductile iron at the casting edge. The reinforcing phase for the composite zone was TiC carbide, obtained by in-situ synthesis of substrates introduced into the mould in the form of compacts. The composition of the substrates of the reaction of the TiC synthesis was next enriched with an Fe filler added in an amount of 10 and 50 wt. % to investigate the possibility of changing the hardness of the composite zone. The addition of filler changed the surface fraction and the average size of TiC precipitates. In the case of the 50 wt. % addition, a tenfold reduction in the dimensions of the carbides was obtained. This increased their surface fraction relative to the compact composition containing only 10 wt. % of the filler. Changes in mechanical properties were analysed within the zone area by the measurement of hardness HV. The study showed a gradual decrease of the zone hardness in function of the amount of the filler added. This trend was also true as regards the composite zone in castings, where a significant refinement and increased surface content of the TiC precipitates was observed.

Effect of Holding Time on Microstructure and Properties of VC/Fe Composite

2012 ◽  
Vol 723 ◽  
pp. 353-357
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Relative Density ◽  
Bending Strength ◽  
Holding Time ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Relationship Of ◽  
The Relationship ◽  
Better Than

The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different holding time were studied. Holding time can influence the mechanical properties, with the holding time rising, when the holding time is 80 min, the hardness is Max, it’s 10.71 GPa, the enhancing range is 37.66%; The relative density changes slower from 60 to 100 min; when the holding time is 60 minutes, fracture toughness and bending strength of material is 16.17 MPa•m 1/2 and 1070 MPa, it’s better than before.

scholarly journals The Correlation of Microstructure and Mechanical Properties of In-Situ Al-Mg2Si Cast Composite Processed by Equal Channel Angular Pressing

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1553 ◽  
Author(s):  
Mahdi Chegini ◽  
Mohammad Shaeri ◽  
Reza Taghiabadi ◽  
Sajjad Chegini ◽  
Faramarz Djavanroodi
Keyword(s):  
Mechanical Properties ◽  
Uniform Distribution ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Ecap Process ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Shear Punch ◽  
Average Size

In this paper, the effect of equal channel angular pressing (ECAP) on microstructure and mechanical properties of hypereutectic Al-20%Mg2Si and Al-15%Mg2Si, as well as hypoeutectic Al-10%Mg2Si composites has been investigated. After fabricating the composites by in-situ casting, the composites were processed using the ECAP process up to two passes at room temperature. Microstructural studies have been carried out using a field emission scanning electron microscopy equipped with an energy dispersive X-ray spectrometer. Mechanical properties were also documented using Vickers microhardness and shear punch tests. In the hypereutectic composites, a decrease in the average size of pro-eutectic Mg2Si (Mg2Sip) particles, breakages in eutectic networks, and lengthening of the Al (α) phase in direction of shear bands were observed after the ECAP process. For instance, the average size of Mg2Sip Particles in Al-20%Mg2Si composite reduced from 40 to 17 μm after 2 passes of ECAP. Furthermore, a uniform distribution of Mg2Sip particles was developed in the matrix. In hypoeutectic composite, the ECAP process caused a uniform distribution of eutectic Mg2Si (Mg2SiE) in the matrix that considered a favorable microstructure. Microhardness measurements and shear punch results showed an ascending trend after each pass of ECAP for all specimens. For example, microhardness and shear strength of Al-20%Mg2Si increased from 88 HV and 109 MPa to 119 HV and 249 MPa after two passes indicating 35% and 34% increments, respectively. Density and porosity calculations by Archimedes principle revealed that the density of the composites increased after two passes of ECAP due to the reduction of porosity.

The effect of Hf and Ti additions on microstructure and properties of Cr2Nb–Nb in situ composites

1996 ◽  
Vol 11 (8) ◽  
pp. 1917-1922 ◽  
Author(s):  
B.P. Bewlay ◽  
M. R. Jackson
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Laves Phase ◽  
Directionally Solidified ◽  
Two Phase ◽  
In Situ Composites ◽  
Niobium Silicide ◽  
Microstructure And Properties ◽  
Two Phases

The present paper describes the effect of Hf and Ti additions on the microstructures and mechanical properties of two-phase composites based on the Cr2Nb–Nb eutectic. The microstructures of directionally solidified in situ composites containing 50–70% by volume of the Laves phase Cr2Nb which was modified with Hf (7.5–9.2%) and Ti (16.5–26%) are described. Partitioning of Hf and Ti between the two phases is discussed using microprobe and EDS results. The tensile properties at 1100 and 1200 °C are described and compared with those of an analogous niobium silicide-based composite. The Cr2(Nb)–(Nb) composite tensile yield strengths at 1200 °C were increased over that of monolithic Cr2Nb to ∼130 MPa. However, at 1200 °C the yield strengths of the silicide-based composites were approximately twice those of the Cr2(Nb)–(Nb) composites.

scholarly journals Fabrication, Microstructure, and Properties of In Situ V2C-Reinforced Copper Composites

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1829
Author(s):  
Yu Quan ◽  
Baotong Hu ◽  
Shuai Fu ◽  
Detian Wan ◽  
Yiwang Bao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Physical And Mechanical Properties ◽  
Microstructure And Properties

In this paper, in situ V2C-reinforced Cu composites were successfully fabricated by hot pressing at 750 °C under 25 MPa using Cu and V2SnC powders. Due to decomposition of V2SnC to V2C and Sn during sintering, Sn atoms entered the crystal structure of Cu. Therefore, final compositions of composites consisted of Cu(Sn) and V2C phases. Here, copper composites with 0, 5, 10, 20, and 30 vol.% V2C were designed. Their microstructures and physical and mechanical properties were systematically investigated. It was observed that with increasing V2C content, electrical conductivity decreased from 0.589 × 108 S·m−1 to 0.034 × 108 S·m−1 and thermal conductivity decreased from 384.36 W⋅m−1⋅K−1 to 24.65 W·m−1·K−1, while Vickers hardness increased from 52.6 HV to 334 HV. Furthermore, it was found that composites with 20 vol.% V2C had the highest tensile strength (440 MPa).

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