Influence of microelement Hf on microstructure, mechanical properties and shielding effect of W-Ni-Fe alloy

Tang, Dewen; Zou, Shuliang; Liang, Yu‐Feng

doi:10.1016/j.jallcom.2017.07.037

Cited by 15 publications

(2 citation statements)

References 12 publications

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“…Although W-1.5 Y-30 Hf has a flat surface, it is too unstable at high temperatures to withstand ablation. This can be ascribed to the increased press in sintering with the excessive addition of Hf, resulting in cracking behaviour during the high-temperature ablation process [ 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and High-Temperature Ablation Behaviour of Hafnium-Doped Tungsten-Yttrium Alloys

Huang

Zhang

et al. 2023

Materials

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W is a widely used refractory metal with ultra-high melting point up to 3410 °C. However, its applications are limited by poor ablation resistance under high-temperature flame and air flow, which is crucial for aerospace vehicles. To improve the ablation resistance of W under extreme conditions, W-Y alloys doped with different Hf mass fractions (0, 10, 20, and 30) were prepared using the fast hot pressing sintering method. Microstructure and ablation behaviours at 2000 °C were investigated. Results showed that adding an appropriate amount of Hf improved the properties of the W-Y alloy evidently. In particular, the hardness of the alloy increased with the increased content of Hf. The formation of the HfO2 layer on the surface during ablation decreased the mass and linear ablation rates, indicating enhanced ablation resistance. However, excessive Hf addition will result in crack behaviour during ablation. With a Hf content of 20 wt.%, the alloy exhibited high stability and an excellent ablation resistance.

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Section: Resultsmentioning

confidence: 99%

Microstructure and High-Temperature Ablation Behaviour of Hafnium-Doped Tungsten-Yttrium Alloys

Huang

Zhang

et al. 2023

Materials

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“…Influence of Hf impurity on microstructure and mechanical properties of the W-Fe-Ni alloys was reported in Ref. [2]. Doping of the TiFe phase by hafnium has a positive effect on the activation properties [3].…”

Section: Introductionmentioning

confidence: 99%

Phase equilibrium diagram of the Hf-Fe-Sn system at 1070 K

Romaka

Stadnyk

et al. 2021

Phys. Chem. Solid St.

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Experimental studies of the phase equilibrium diagram of the Hf-Fe-Sn ternary system at 1070 K were performed by X-ray powder diffractometry, scanning electron microscopy and electron probe microanalysis techniques in the whole concentration range. At annealing temperature four ternary compounds are realized: Hf6FeSn2 (K2UF6 structure type, space group P-62m), Hf1.8Fe5Sn3.8 (Hf1.82Fe5Sn3.82 structure type, space group Cmmm), Hf3Fe4Sn4 (Zr3Fe4Sn4 structure type, space group Pnma), and Hf9Fe3.7Sn10.3 (Hf9Fe4Sn10 structure type, space group Cmc21). An existence of the Hf1-xFe2+x-ySny solid solution formed by substitution of the iron atoms by tin in the Hf1-xFe2+x (MgZn2-type) binary compound up to 19 at. % Sn was found. Solubility of Fe in the Hf5Sn3 binary (Mn5Si3-type) extends up to 10 at. % (a=0.8363(2)-0.8324(4), c=0.5726(1)-0.5686(4) nm).

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Research Progress of Metal-Based Shielding Materials for Neutron and Gamma Rays

Gan

Liu

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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Influence of microelement Hf on microstructure, mechanical properties and shielding effect of W-Ni-Fe alloy

Cited by 15 publications

References 12 publications

Microstructure and High-Temperature Ablation Behaviour of Hafnium-Doped Tungsten-Yttrium Alloys

Microstructure and High-Temperature Ablation Behaviour of Hafnium-Doped Tungsten-Yttrium Alloys

Phase equilibrium diagram of the Hf-Fe-Sn system at 1070 K

Research Progress of Metal-Based Shielding Materials for Neutron and Gamma Rays

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