High-entropy alloys (HEAs) show good mechanical properties like high strength, hardness and wear resistance, this makes them attractive for application in diamond tools. However, there are severe obstacles to improving the of normal tools with metal-matrix alloys. Here, we report formation FeCoCrNiMo HEAs by powder metallurgy processing, starting from a gas-atomised followed milling consolidation spark plasma sintering. Our results that pure FCC phase can be obtained method. Specimens higher...

This study reports the results of addition diamonds in sintering process a FCC-structured CoCrFeNiMo high-entropy alloy. The effect raw powder states such as elemental mixed (EM) powder, gas atomization (GA) and mechanical alloying (MA) on uniformity constituent phase was also investigated. Examination microstructure evaluation properties composites depending mixing processes were performed. As result, GA+MA composite showed highest properties. experimental indicated that manufacturing...

A novel graded material of a high-entropy alloy (HEA) FeCoCrNiMo was fabricated by spark plasma sintering (SPS) processing. After SPS, the HEA specimens consisted single face-centred cubic (FCC) phase in center, but dual FCC and tetragonal structure σ near surface. Surprisingly, pressure sufficient to influence proportion phases, thus properties samples. The hardness sintered under pressures 30, 35, 40 MPa increased gradually from 210 HV0.2, which is maximum value surface as result gradual...

SiC particles-reinforced Al matrix composites (SiCp/AMCs) have been widely used in the aerospace structural components. In this work, 20 vol% SiCp/2A14 joint was fabricated by laser welding technology. The effects of different power/welding velocity on forming, microstructure evolution and mechanical properties were studied detail. results showed that, under same heat input, high power/high beneficial to reduce porosity inhibited formation brittle phase Al4C3. At 8 kW-133 mm/s parameters,...

A high oxygen content can lead to metallurgical defects such as holes and microcracks in the products of selective laser melting (SLM) that significantly reduce density mechanical properties a denture. In this study, batch Co–Cr alloy powder was subjected forced oxidation. SLM used prepare specimens from before after treatment for performance tests. The results showed powders with contents 184 616 ppm could both achieve good shaping under identical conditions. There no significant difference...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

In this study, the Ti3SiC2/IN625 matrix composites was fabricated by laser directed energy deposition technology. The microstructure evolution and mechanical properties at room high temperature of Ti3SiC2/ IN625 were studied. results show that with addition Ti3SiC2, evolve from a columnar dendritic γ-(Ni, Cr) to cellular dendrites matrix. Ti3SiC2 decomposes in melt pool due its unique crystal structure combines deviated Nb Mo elements produce large number fine-sized particle rod-like...

Welding problems have restricted the applications of lightweight SiCp/Al composites in aerospace. In this work, controllability keyhole mode, nucleation mechanism, and mechanical properties laser-welding process are studied detail. The mode was found to strongly affect migration reaction behaviors SiC. extrusion effect formed by open pushes SiC particles bottom molten pool. To observe growth mechanism Al4C3 laser-welded SiCp/2A14Al composites, dissolution–precipitation behavior tip were...

The application of lightweight and high-strength Al alloys are crucial to reduce energy consumption emissions in today's world. high strength 7 series aluminum alloy is widely used aerospace, but its poor welding performance has been a bottleneck restricting the further structural parts. In this work, joint with tensile ~ 400 MPa was successfully prepared by single mode laser beam using non-weldable 7075 as experimental mode. superfine reduces volume molten pool increases solidification rate...

Abstract In this paper, the driving force of electric four-wheel drive rodless aircraft tractor during obstacle crossing is monitored in real time, and relationship between forces under different obstacle-crossing conditions analyzed. By comparing influence height, mode, initial speed, wheel load on force, efficient method summarized. analyzing change crossing, necessary theoretical experimental basis provided for design selection a tractor.