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Meeting MS&T23: Materials Science & Technology
Symposium Metal Powder Synthesis and Processing: Fundamental Aspects and Modeling
Presentation Title Resolving the Sintering Conundrum of Tungsten Alloys
Author(s) Lin Zhang, Zhongyou Que, Xingyu Li, Xuanhui Qu
On-Site Speaker (Planned) Lin Zhang
Abstract Scope Ultrafine-grained tungsten alloys have important applications in aerospace, semiconductor, high-temperature equipment and nuclear energy because of their outstanding high-temperature mechanical properties. Powder metallurgy, with excellent controlled chemistry and near-net shape manufacturing, is optimal method for producing tungsten alloys. However, the high temperature of powder metallurgy makes the grain size grow rapidly during the densification process. How to maintain fine grain structure and achieve complete densification is still a sintering conundrum. This paper reports the successful production of dense tungsten and tungsten-rhenium alloys with average grain size of ~300 nm and uniform microstructure by pressureless two-step sintering. Further, the densification kinetics and grain growth were studied respectively, and the advantages of pressureless two-step sintering to produce tungsten alloys were clarified. Our works shows the scientific understanding and technological practices of producing ultrafine-grained tungsten alloy by pressureless two-step sintering. Keywords: Tungsten alloys; Two-step sintering; Densification; Grain growth; Ultrafine-grained materials.


Advanced Characterization of Defects in Superalloy Powders Atomized by Various Methods and Effects on Net-shape HIP Product
Effect of Li Concentration on Morphology of Precipitates in Nanocrystalline Cu-3Ta
FEM Analysis of Temperature and Stress Distribution Behavior of Al20Cr20Fe25Ni25Mn10 High Entropy Alloy in Spark Plasma Sintering: Effect of Consolidation Time on Microstructure
Flowability and Suitability of Mechanically Derived Powders for Additive Manufacturing
Microstructural Characterization of Zn-3Mg(wt.%) Processed by High-pressure Torsion
Microstructure Alignment Effects from Engineered Cooling during Additive Manufacturing of Alnico Magnets from Pre-alloyed Powder
Resolving the Sintering Conundrum of Tungsten Alloys
Understanding the Geometry Accuracy and Surface Roughness of Thin Wall Structures for 316L Stainless Steel in Laser Powder Bed Fusion Additive Manufacturing
Vacuum Hot Pressing of Oxide-dispersion Strengthened (ODS) Ferritic Steel Powders Guided by Temperature-scanning High-energy X-ray Powder Diffraction Analysis

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