Mechanical Property of (Al, Mg)B2 Phase Reinforced Al-Mg-B Alloys

2013 ◽  
Vol 813 ◽  
pp. 47-50
Author(s):  
Jae Ik Cho ◽  
Cheol Woo Kim
Keyword(s):  
Mechanical Property ◽  
Ternary Alloy ◽  
Composite System ◽  
Solidification Process ◽  
Mechanical Behaviors ◽  
Dendritic Region ◽  
Initial Solidification

The microstructure and mechanical behaviors of the Al-Mg-B ternary alloy have been investigated in order to fabricate a composite system composed of (Al,Mg)B2 in a Al-Mg matrix. Several Al-Mg-B ternary alloy compositions were selected for identification of borides and matrix formation during solidification. The in-situ (Al,Mg)B2 phase was developed in an eutectic matrix of Al8Mg5 and Al, and formed in the location of inter and intra the Al dendritic region, indicating that the formation of (Al,Mg)B2 was developed at the initial solidification process. Dominating factors for controlling the (Al,Mg)B2 phase and mechanical behaviors are discussed in terms of structural identifications.

scholarly journals Study of the Effect of Carbon on the Contraction of Hypo-Peritectic Steels during Initial Solidification by Surface Roughness

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 982 ◽  
Author(s):  
Dazhi Pu ◽  
Guanghua Wen ◽  
Dachao Fu ◽  
Ping Tang ◽  
Junli Guo
Keyword(s):  
Surface Roughness ◽  
Cooling Rate ◽  
Solidification Process ◽  
Casting Process ◽  
Continuous Casting Process ◽  
Peritectic Steel ◽  
Laser Confocal Microscope ◽  
Initial Solidification

In the continuous casting process, the shrinkage of the peritectic phase transition during the initial solidification process has an important influence on the surface quality of peritectic steel. The initial solidification process of 0.10C%, 0.14C%, and 0.16C% peritectic steels was observed in situ by a high temperature laser confocal microscope, and the contraction degree during initial solidification was characterized by surface roughness. The results showed that under the cooling rate of 20 °C/s, the surface roughness value Ra(δ/γ) of 0.10C% peritectic steel was 32 μm, the Ra(δ/γ) value of 0.14C% peritectic steel was 25 μm, and the Ra(δ/γ) value of 0.16C% peritectic steel was 17 μm. With increasing carbon content, the contraction degree of the δ→γ transformation decreased, and the value of the surface roughness Ra(δ/γ) declined. Therefore, surface roughness can characterize the contraction degree of the δ→γ transformation in the initial solidification process of peritectic steel under the condition of a large cooling rate.

scholarly journals In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6531 ◽  
Author(s):  
Zongxing Zou ◽  
Qi Zhang ◽  
Chengren Xiong ◽  
Huiming Tang ◽  
Lei Fan ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Plastic Deformation ◽  
Shear Test ◽  
Slip Zone ◽  
Three Gorges Reservoir Area ◽  
Silty Clay ◽  
Sigmoid Function ◽  
In Situ Test ◽  
Deformation Stage

Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deformation process of the gravelly slip zone soil includes an elastic deformation stage, elastic–plastic deformation stage, and plastic deformation stage. Four functions were introduced to express the shear constitutive model of the gravelly slip zone soil, and the asymmetric sigmoid function was demonstrated to be the optimum one to describe the relationship of the shear stress and shear displacement with a correlation coefficient of 0.986. The comparison between the in situ test and indoor direct shear test indicates that gravels increase the strength of the slip zone soil. Therefore, the shear strength parameters of the gravelly slip zone soil obtained by the in situ test are more preferable for evaluating the stability of the landslide and designing the anti-slide structures.

Thermopower of an Oxide-Alloy Composite System Obtained by In Situ Carbothermal Synthesis

2011 ◽  
Vol 40 (5) ◽  
pp. 1190-1194
Author(s):  
Wenbin Su ◽  
Chunlei Wang ◽  
Hongchao Wang ◽  
Jian Liu ◽  
Peng Zheng ◽  
...  
Keyword(s):  
Composite System ◽  
Alloy Composite ◽  
Carbothermal Synthesis

Measurement of Cement in Situ Stresses and Mechanical Properties Without Cooling or Depressurization

2021 ◽  
Author(s):  
Meng Meng ◽  
Luke Frash ◽  
James Carey ◽  
Wenfeng Li ◽  
Nathan Welch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Elastic Modulus ◽  
Poisson’S Ratio ◽  
Axial Stress ◽  
Triaxial Compression ◽  
In Situ Measurement ◽  
Poisson's Ratio ◽  
Ambient Conditions

Abstract Accurate characterization of oilwell cement mechanical properties is a prerequisite for maintaining long-term wellbore integrity. The drawback of the most widely used technique is unable to measure the mechanical property under in situ curing environment. We developed a high pressure and high temperature vessel that can hydrate cement under downhole conditions and directly measure its elastic modulus and Poisson's ratio at any interested time point without cooling or depressurization. The equipment has been validated by using water and a reasonable bulk modulus of 2.37 GPa was captured. Neat Class G cement was hydrated in this equipment for seven days under axial stress of 40 MPa, and an in situ measurement in the elastic range shows elastic modulus of 37.3 GPa and Poisson's ratio of 0.15. After that, the specimen was taken out from the vessel, and setted up in the triaxial compression platform. Under a similar confining pressure condition, elastic modulus was 23.6 GPa and Possion's ratio was 0.26. We also measured the properties of cement with the same batch of the slurry but cured under ambient conditions. The elastic modulus was 1.63 GPa, and Poisson's ratio was 0.085. Therefore, we found that the curing condition is significant to cement mechanical property, and the traditional cooling or depressurization method could provide mechanical properties that were quite different (50% difference) from the in situ measurement.

scholarly journals In situ synthesis of MWCNT-graft-polyimides: thermal stability, mechanical property and thermal conductivity

RSC Advances ◽  
2020 ◽  
Vol 10 (23) ◽  
pp. 13517-13524
Author(s):  
Chunbo Wang ◽  
Bing Cong ◽  
Junyu Zhao ◽  
Xiaogang Zhao ◽  
Daming Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Property ◽  
Thermal Stability ◽  
In Situ Synthesis ◽  
Enhanced Thermal Conductivity

In situ synthesis of MWCNT-graft-polyimides enhanced thermal conductivity at a relatively low loading.

In Situ Observation of Macro and Micro Solidification Process in the Molten Pool during Laser Remelting

Applied laser ◽  
2015 ◽  
Vol 35 (1) ◽  
pp. 20-24
Author(s):  
王永辉 Wang Yonghui ◽  
林鑫 Lin Xin ◽  
王理林 Wang Lilin ◽  
杨海欧 Yang Haiou ◽  
黄卫东 Huang Weidong
Keyword(s):  
Molten Pool ◽  
Solidification Process ◽  
In Situ Observation ◽  
Laser Remelting

Effects of Si content on the microstructure and tensile strength of an in situAl/Mg2Si composite

1999 ◽  
Vol 14 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Jian Zhang ◽  
Yu-qing Wang ◽  
Bing Yang ◽  
Ben-lian Zhou
Keyword(s):  
Tensile Strength ◽  
Metal Matrix ◽  
Die Casting ◽  
Solidification Process ◽  
Matrix Composites ◽  
Fracture Characteristics ◽  
Casting Technique ◽  
Si Content ◽  
Strength And Ductility

Al/Mg2Si composites were in situ fabricated by the usual die-casting technique, and effects of the Si contents in the composites on microstructures and tensile strengths were investigated. Experimental results show that extra Si contents in Al/Mg2Si composites induce a ductile matrix and a uniform distribution of in situ particles. The refined microstructures lead to an obvious increase in both strength and ductility of the metal matrix composites (MMCs). The effects of extra Si on both the solidification process and fracture characteristics of the Al/Mg2Si composites were analyzed.

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