Recent Progress in Processing of Tungsten Heavy Alloys

Şahin, Yusuf

doi:10.1155/2014/764306

Cited by 85 publications

(30 citation statements)

References 132 publications

(222 reference statements)

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“…Tungsten alloy was used to produce the elastic body. As listed in Table 1 [ 23 ], it offers high Young’s modulus and yield strength, which can help to increase the measuring range of the sensor. In addition, tungsten alloy also has a high melting point and low coefficient of thermal expansion (CTE), which can help the sensor work at high temperature.…”

Section: Methodsmentioning

confidence: 99%

Research of a Novel Ultra-High Pressure Sensor with High-Temperature Resistance

Zhang

Zhao

et al. 2017

Micromachines

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Ultra-high pressure measurement has significant applications in various fields such as high pressure synthesis of new materials and ultra-high pressure vessel monitoring. This paper proposes a novel ultra-high pressure sensor combining a truncated-cone structure and a silicon-on-insulator (SOI) piezoresistive element for measuring the pressure up to 1.6 GPa. The truncated-cone structure attenuates the measured pressure to a level that can be detected by the SOI piezoresistive element. Four piezoresistors of the SOI piezoresistive element are placed along specific crystal orientation and configured as a Wheatstone bridge to obtain voltage signals. The sensor has an advantage of high-temperature resistance, in that the structure of the piezoresistive element can avoid the leakage current at high temperature and the truncated-cone structure separates the piezoresistive element from the heat environment. Furthermore, the upper surface diameter of the truncated-cone structure is designed to be 2 mm for the application of small scale. The results of static calibration show that the sensor exhibits a good performance in hysteresis and repeatability. The temperature experiment indicates that the sensor can work steadily at high temperature. This study would provide a better insight to the research of ultra-high pressure sensors with larger range and smaller size.

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Section: Methodsmentioning

confidence: 99%

Research of a Novel Ultra-High Pressure Sensor with High-Temperature Resistance

Zhang

Zhao

et al. 2017

Micromachines

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“…WHAs are used in radiation shields, kinetic energy penetrators, counterbalances, vibration dampers, and rocket nozzles. A good review paper on WHAs can be found in [41].…”

Section: Introductionmentioning

confidence: 99%

“…WHAs generally have fairly good room to high-temperature tensile strength and ductility [28][29][30][31][34][35][36][39][40][41]. However, the key limiting structural property for W and W-alloys is usually fracture toughness and a high brittle to ductile transition temperature (BDTT) [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

Alam

Odette

2020

Acta Materialia

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Tungsten is generally too brittle to serve a robust structural function. Here, we explore the fracture toughness of 90 to 97 wt.%W Fe-Ni liquid phase sintered tungsten heavy alloys (WHAs). The room temperature (RT) maximum load fracture toughness (KJm ≈ 69 to 107 MPa√m) of the WHA, containing only 3 to 10 wt.% of a Ni-Fe ductile phase (DP), is ≈ 9 to 13 times higher than KIc typical of monolithic W (≈ 8 MPa√m). All the WHAs show extensive stable crack growth, and increasing blunting line toughness averaging ≈ 170 MPa√m, prior to significant crack extension. In contrast to classical ductile phase toughening, that is primarily due to macrocrack bridging, the WHA toughness increase mainly involves new mechanisms associated with arrest, blunting and bridging of numerous dilatational shielding process zone microcracks in the macrocrack process zone. Tests down to-196°C, to partially emulate irradiation hardening, show decreasing toughness and a transition to elastic fracture at a temperature of-150°C for 90W to-25ºC for 97W. However, even at-196°C, the leanest DP 97W WHA KIc is ≈ 3 times that of monolithic W at RT. Possible effects of the small specimen size used in this study are briefly summarized.

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“…Tungsten-based composites are always processed through powder metallurgy using element powders [6]. However, this may be not a feasible method to fabricate WeNiTi composites because of the composition sensitivity of martensitic transformation of NiTi alloys.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, microstructure and mechanical properties of W NiTi composites

Shao

Guo

Huan

et al. 2017

Journal of Alloys and Compounds

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a b s t r a c tNew two-phase tungsten-based composites containing 88 wt% tungsten powders and 12 wt% nearly equiatomic NiTi alloy deforming by martensite variant detwinning were fabricated by infiltration and hot pressing in this study. 53 Nb 5 composite exhibited a double-yielding phenomenon under compression with an ultimate compressive strength of 3820 MPa and a deformation of 50.4%. In-situ synchrotron high-energy Xray diffraction measurements revealed the first yielding was caused by the martensite reorientation of the NiTi matrix and the second was due to the commencement of massive plastic deformation of the reoriented martensite and is also attributed to the microscopic internal fracturing of the W particles.

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Recent Progress in Processing of Tungsten Heavy Alloys

Cited by 85 publications

References 132 publications

Research of a Novel Ultra-High Pressure Sensor with High-Temperature Resistance

Research of a Novel Ultra-High Pressure Sensor with High-Temperature Resistance

On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

Fabrication, microstructure and mechanical properties of W NiTi composites

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