scholarly journals Preparation of high-strength and lightweight microcellular polysulfone foam with a segregated CNT network for excellent electromagnetic shielding

RSC Advances ◽  
2020 ◽  
Vol 10 (20) ◽  
pp. 11994-12003
Author(s):  
Yeping Xie ◽  
Fan Ye ◽  
Wenhua Chen ◽  
Jiahong Tang ◽  
Pengju Liu
Keyword(s):  
Solid Phase ◽  
High Strength ◽  
Electromagnetic Shielding ◽  
Segregated Structure

Microporous PSU/CNTs foams with segregated structure was prepared by combining the solid-phase milling and sc-CO2 foaming.

scholarly journals Comprehensive Analysis of the Microstructure and Mechanical Properties of Friction-Stir-Welded Low-Carbon High-Strength Steels with Tensile Strengths Ranging from 590 MPa to 1.5 GPa

2021 ◽  
Vol 11 (12) ◽  
pp. 5728
Author(s):  
HyeonJeong You ◽  
Minjung Kang ◽  
Sung Yi ◽  
Soongkeun Hyun ◽  
Cheolhee Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Joint Strength ◽  
Solid Phase ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
Friction Stir ◽  
Welding Processes

High-strength steels are being increasingly employed in the automotive industry, requiring efficient welding processes. This study analyzed the materials and mechanical properties of high-strength automotive steels with strengths ranging from 590 MPa to 1500 MPa, subjected to friction stir welding (FSW), which is a solid-phase welding process. The high-strength steels were hardened by a high fraction of martensite, and the welds were composed of a recrystallized zone (RZ), a partially recrystallized zone (PRZ), a tempered zone (TZ), and an unaffected base metal (BM). The RZ exhibited a higher hardness than the BM and was fully martensitic when the BM strength was 980 MPa or higher. When the BM strength was 780 MPa or higher, the PRZ and TZ softened owing to tempered martensitic formation and were the fracture locations in the tensile test, whereas BM fracture occurred in the tensile test of the 590 MPa steel weld. The joint strength, determined by the hardness and width of the softened zone, increased and then saturated with an increase in the BM strength. From the results, we can conclude that the thermal history and size of the PRZ and TZ should be controlled to enhance the joint strength of automotive steels.

Influence of vanadium on microstructure and mechanical properties of layered composites based on the niobium-aluminum system obtained with use of solid-phase technology

2020 ◽  
Vol 10 ◽  
pp. 2-7
Author(s):  
D.V. Prokhorov ◽  
◽  
V.P. Korzhov ◽  
A.N. Nekrasov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Resistance ◽  
Intermetallic Compounds ◽  
Solid Phase ◽  
High Strength ◽  
Vanadium Content ◽  
Diffusion Welding ◽  
Layered Composites ◽  
Niobium Aluminum ◽  
Niobium Doped

he microstructure and heat resistance characteristics of layered composites from Nb—V alloys and intermetallic compounds with aluminum are presented. Composites which are made by diffusion welding under pressure have structures from alternate foils of niobium doped with vanadium with 5, 10 and 15% (at.) and hardening layers of aluminum. It has been found out that the alternation of viscous-plastic layers of Nb—V alloy and hardening layers of aluminum ensures high strength of the composites at 20—1300 °С temperature, that increases when vanadium content in Nb—V alloy increases.

Effect of Runner Distance on Microstructure and Properties of Semi-Solid Squeeze Casting CuSn10P1 Alloy

2022 ◽  
Vol 327 ◽  
pp. 156-162
Author(s):  
Yong Kun Li ◽  
Pei Lin Cai ◽  
Zhi Long He ◽  
Rong Feng Zhou ◽  
Lu Li ◽  
...  
Keyword(s):  
Squeeze Casting ◽  
Solid Phase ◽  
High Strength ◽  
Shrinkage Porosity ◽  
Microstructure And Properties ◽  
Shrinkage Defects ◽  
Porosity Defects ◽  
Semi Solid ◽  
Slope Channel ◽  
Better Than

It is easy to form reverse segregation and shrinkage porosity defects during the solidification of CuSn10P1 alloy, which leads to the poor properties and limits its application in high strength and toughness parts. In this paper, semi-solid CuSn10P1 alloy slurry was prepared by enclosed cooling slope channel (for short ECSC). The effect of runner distance on microstructure and properties by liquid squeeze casting and semi-solid squeeze casting was studied. The results showed that the microstructure of semi-solid squeeze casting is finer than that of liquid squeeze casting, and the shrinkage defects are improved. The solid fraction with 65 mm runner is lower than that without runner in liquid squeeze casting and semi-solid squeeze casting due to the retention effect of solid phase in semi-solid slurry flow, but the properties with 65 mm runner is better than that without runner. The ultimate tensile strength, yield strength and elongation of semi-solid squeeze casting CuSn10P1 alloy with 65 mm runner distance reached 466.5 MPa, 273.6 MPa and 13.4%, which were improved by 26%, 19% and 97%, respectively, as compared to that of liquid squeeze casting.

Study of Low Density and High Strength Slag MTC System

2014 ◽  
Vol 953-954 ◽  
pp. 1628-1632
Author(s):  
Di Hui Ma ◽  
Wei Jiang Jia
Keyword(s):  
Particle Distribution ◽  
Solid Phase ◽  
High Strength ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Low Density ◽  
Fluid System ◽  
Deep Wells ◽  
Interfacial Bonding Strength ◽  
Slurry System

With the demand of improving the second interfacial bonding strength and environmental protection, MTC cementing technology has obvious technical and economic advantages. However, due to containing lots of low-density materials and slurry treating agents, which make low strength, the application of low-density slag MTC cementing slurry system is restricted in the cementing of deep wells and low-pressure leakiness formations. According to the theory of particle distribution and based on particle size analysis of floating bead, micro silicon and slag, solid-phase proportioning design of low-density (1.35~1.55 g/cm3) slag MTC was carried out in this paper. By adjusting the adding amount of micro silicon and activators, the slag MTC cementing fluid system with the 24-hour compressive strength greater than 21.6MPa which has the density range of 1.35 to 1.55g/cm3 was get. This system has small initial consistency, short thickening transition time, low water loss and good rheological property. And at last, the mechanism of improving the strength of low-density slag MTC cementing fluid system was analyzed.

A study of the oriented composites with the conductive segregated structure obtained via solid-phase processing of the UHMWPE reactor powder mixed with the carbon nanofillers

2016 ◽  
Author(s):  
Oleg V. Lebedev ◽  
Alexander S. Kechek’yan ◽  
Vitaly G. Shevchenko ◽  
Tikhon S. Kurkin ◽  
Evgeny K. Golubev ◽  
...  
Keyword(s):  
Solid Phase ◽  
Reactor Powder ◽  
Carbon Nanofillers ◽  
Segregated Structure

In Situ Decomposition of Silicon Nitride Particles in Titanium Composite and its Mechanical Properties

2017 ◽  
Vol 737 ◽  
pp. 38-43
Author(s):  
Hisashi Imai ◽  
Hiroyasu Yamabe ◽  
Katsuyoshi Kondoh ◽  
Junko Umeda ◽  
Anak Khantachawana
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Solid Phase ◽  
High Strength ◽  
Solid Solution Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solution Strengthening ◽  
Ti Powder

Dependence of the mechanical properties of PM extruded titanium with the silicon nitride (Si3N4) on solid phase decomposition of Si3N4 was investigated. Si3N4 particles within Ti composite powder were decomposed during spark plasma sintering at 1223 K with 30 MPa pressure for 3.6 ks; and then, decomposition by-products of nitrogen and silicon atoms were defused into titanium matrix. The extruded Ti-1.0 mass% Si3N4 composite showed ultimate tensile strength (UTS) of 1139 MPa, and yield stress (0.2%YS) of 1065 MPa. UTS and 0.2%YS of P/M extruded Ti-1.0 mass% Si3N4 composite were 2 and 2.5 times compared to extruded pure Ti powder material, respectively. It was considered that the solid solution strengthening of both nitrogen and silicon originated from Si3N4 caused the high strength of PM extruded Ti-1.0 mass% Si3N4 composite.

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