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000904059 1001_ $$0P:(DE-Juel1)179374$$aLiu, R.$$b0
000904059 245__ $$aThe effect of bonding temperature on the bending behaviors and toughening mechanism of W/(Ti/Ta/Ti) multilayer composites prepared by field activated sintering technique
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000904059 520__ $$aThe gradient layered structure is beneficial to improve both strength and fracture toughness of tungsten. In this study, a series of W/(Ti/Ta/Ti) multilayer composites with gradient layered structure are prepared by field activated sintering technique (FAST) with bonding temperatures ranging from 1000 °C to 1400 °C. The results show that both the microstructure and mechanical properties vary with bonding temperatures. Both W and Ta diffuse into Ti layer to stabilize β phase, resulting in the Ti layer with α/β phase. The W/(Ti/Ta/Ti) composites bonded at 1200 °C exhibited the highest flexural strength (1700 MPa) attributed to excellent microstructure combination in the different layers, which are elongated grains and fine recrystallized grains in the W layer, and the martensite basketweave microstructure in Ti layer. Shear bands can be seen in the Ti layer with planar slip-bands and Ta layer with wavy slip-bands. These plastic deformation behaviors cannot be observed in the W layer because it is inherently brittle, similar to ceramic. The toughening mechanism of the W/(Ti/Ta/Ti) composites is as follows: crack deflection and delamination between the interface, multi-crack propagation in the W layer, and local shear deformation in the toughened layer. The bending properties of W/(Ti/Ta/Ti) multilayer composites are related to the interface and the gradient structure of the toughened layer (Ti/Ta/Ti), which can guide the design of the microstructure of the composites and improve its mechanical properties.
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000904059 7001_ $$aHou, X. S.$$b1
000904059 7001_ $$0P:(DE-Juel1)156421$$aYang, S. Y.$$b2
000904059 7001_ $$aChen, C.$$b3
000904059 7001_ $$0P:(DE-Juel1)165931$$aMao, Yiran$$b4$$eCorresponding author$$ufzj
000904059 7001_ $$aWang, S.$$b5
000904059 7001_ $$0P:(DE-HGF)0$$aZhong, Z. H.$$b6
000904059 7001_ $$aZhang, Z.$$b7
000904059 7001_ $$0P:(DE-Juel1)167381$$aLu, P.$$b8
000904059 7001_ $$aWu, Y. C.$$b9
000904059 773__ $$0PERI:(DE-600)1491951-5$$a10.1016/j.matchar.2021.110875$$gVol. 172, p. 110875 -$$p110875 -$$tMaterials characterization$$v172$$x1044-5803$$y2021
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