Functionally Graded W-Cu Materials Prepared from Cu-Coated W Powders by Microwave Sintering

Chen, Wenchao; Chen, Pengqi; Li, Jianfeng; Zhang, Jianhua; Luo, Lei; Cheng, Jigui

doi:10.1007/s11665-019-04321-7

Cited by 11 publications

(13 citation statements)

References 22 publications

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“…The better densification is attained due to the lower porosity during deformation. 22 Therefore, the amount of densification is increasing with the addition of Cu content (up to 10wt. %) to preforms.…”

Section: Resultsmentioning

confidence: 99%

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Rajasekhar

Babu

Davidson

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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An experimental investigation has been performed on the hot formability and densification characteristics of Al-Cu/Al two-layered structure composites. The two-layered composites having different Cu compositions in the Al-Cu layer such as (Cu: 5wt. %, 10wt. %, and 15wt. %) were prepared using the powder metallurgy (P/M) route. The composites were hot-pressed as layer by layer in a steel cylindrical die at 550°C temperature with 0.9 initial relative density (IRD) and 0.1 s−1 strain rate. The preforms were hot deformed between two flat dies with a capacity of 50-ton hydraulic press machine at a temperature range of 150°C – 450°C under triaxial stress state condition. The hot-upsetting behaviour of preforms was analyzed until the cracks begin on the cylindrical preform at the outer surface. The effect of different Cu composition and various deformation temperatures on two-layered preforms were discussed. Results revealed that the (10wt. %Cu) preform achieved good cooperative deformation behaviour between Al-Cu and Al layers at the interface region. The relationship between the process parameters was discussed such as the effect of axial stress ([Formula: see text]), relative density ( R) on axial strain ([Formula: see text]) and formability stress index ( β), different stress ratio parameters ([Formula: see text], [Formula: see text]) on relative density ( R).

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Section: Resultsmentioning

confidence: 99%

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Rajasekhar

Babu

Davidson

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Deng et al [11] studied the CuW composite coating material, and the average hardness was about 200HV, Chen et al [12] proposed that the hardness of CuW70 alloy prepared by traditional methods was about 187±13 HV, while they raised the hardness of CuW70 alloy prepared by microwave sintering method to 204±13 HV, which was lower than the minimum hardness of the alloy we prepared. Figure 5 is the hardness and electrical conductivity curve of CuW alloys with different tungsten powders grading scheme.…”

Section: Hardness and Electrical Conductivitymentioning

confidence: 88%

Effects of grading tungsten powders on properties of CuW alloy

Zou

Song

Shi

2020

Mater. Res. Express

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Considering the advantages and disadvantages of CuW alloys with different single particle size of tungsten powder, CuW alloys with three kinds of tungsten powders: ultramicron (50 μm), micron (6-8 μm), submicron(0.4 μm) were prepared by the infiltration method. Microstructure of the CuW alloy with different grading ration of tungsten powder were characterized via field-emission scanning electron microscope (SEM). The Vacuum electrical breakdown properties were studied by electrical breakdown test. The results shows that the grading tungsten powders can form a variety of W-W sintered necks, strengthen the tungsten skeleton. SEM results show that a suitable ratio of grading tungsten powders can make the infiltrated copper phase more dispersed and uniform. Compared with the tradition CuW alloy, the conductivity is greater than 53.5%IACS, with the lowest hardness of 203HB, the lowest CuW/CrCu bonding strength of 417 MPa and the highest of 495 MPa, the hardness and electrical conductivity increased by 20%-30%, the bonding strength of new CuW/CrCu monolithic materials increased by 20%, vacuum electrical breakdown properties performed good.

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“…For only two material combinations, flexural strengths were measured by more than one research article. W-Cu FGCM system was studied in [153,161]. While hot pressing was used for FGCM fabrication in [153], microwave sintering was used in [161].…”

Section: Flexural Strengthmentioning

confidence: 99%

Review on developments of bulk functionally graded composite materials

Charan

Naik

Kota

et al. 2022

International Materials Reviews

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Monolithic components are often insufficient when a combination of conflicting properties, or a variation in properties at different regions within a material is required. Functionally graded composite materials (FGCM) are a relatively new class of materials with a systematic variation of the composition, microstructure, and properties along one direction. The graded structure offers tailorable property combinations not achievable with monolithic composites and significant recent research has been carried out on their development. An effort has been made in this article to review the latest developments on bulk FGCMs since 2015. The different processing techniques used for their fabrication have been discussed, highlighting their advantages, limitations, and recent advancements pertaining to FGCM fabrication. Various physical, mechanical, and thermal properties of FGCMs have been treated separately, and wherever possible, summary plots combining data from various research articles have been developed. Finally, potential areas for directing future FGCM research have been identified.

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Functionally Graded W-Cu Materials Prepared from Cu-Coated W Powders by Microwave Sintering

Cited by 11 publications

References 22 publications

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Effects of grading tungsten powders on properties of CuW alloy

Review on developments of bulk functionally graded composite materials

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