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Rhenium Alloying of Tungsten Heavy Alloys.

ADA211099

Publication Date	1989
Personal Author	German, R. M.; Bose, A.; Jerman, G.
Page Count	6
Abstract	Alloying experiments have been performed using rhenium additions to a classic 90 mass % tungsten heavy alloy. The mixed powder system was liquid phase sintered to full density at 1500 C in 60 min The rhenium modified alloys exhibited a smaller grain size, higher hardness, higher strength, and lower ductility than the unalloyed system. For an alloy with a composition of 84W-6Re-8Ni-2Fe, the sintered density was 17, 4 Mg/m3 with a yield strength of 815 MPa, tensile strength of 1180 MPa, and elongation to failure of 13%. This property combination results from the aggregate effects of grain size reduction and solid solution hardening due to rhenium. In the unalloyed system these properties require post-sintering swaging and aging; thus, alloying with rhenium is most attractive for applications where net shaping is desired, such as by powder injection molding. Keywords: Powder metallurgy; Reprints. (KT)
Keywords	Addition Injection molding Powder metallurgy Rhenium alloys Sintering Tungsten alloys Density Ductility Elongation Grain size Hardening Hardness Liquid phases Physical properties Mixing Nets Powders Reduction Reprints Shape Solid solutions Solutions(Mixtures)
Source Agency	Army Non Paid Reprints
NTIS Subject Category	71P - Refractory Metals & Alloys
Corporate Authors	Rensselaer Polytechnic Inst., Troy, NY. Dept. of Materials Engineering.; Army Research Office, Research Triangle Park, NC.
Supplemental Notes	Pub. in Powder Metallurgy International, v20 n3 p9-13 1989.
Document Type	Journal Article
NTIS Issue Number	198923
Contract Number	DAAL03-87-K-0072

Rhenium Alloying of Tungsten Heavy Alloys.

Rhenium Alloying of Tungsten Heavy Alloys.
ADA211099

Publication Date	1989
Personal Author	German, R. M.; Bose, A.; Jerman, G.
Page Count	6
Abstract	Alloying experiments have been performed using rhenium additions to a classic 90 mass % tungsten heavy alloy. The mixed powder system was liquid phase sintered to full density at 1500 C in 60 min The rhenium modified alloys exhibited a smaller grain size, higher hardness, higher strength, and lower ductility than the unalloyed system. For an alloy with a composition of 84W-6Re-8Ni-2Fe, the sintered density was 17, 4 Mg/m3 with a yield strength of 815 MPa, tensile strength of 1180 MPa, and elongation to failure of 13%. This property combination results from the aggregate effects of grain size reduction and solid solution hardening due to rhenium. In the unalloyed system these properties require post-sintering swaging and aging; thus, alloying with rhenium is most attractive for applications where net shaping is desired, such as by powder injection molding. Keywords: Powder metallurgy; Reprints. (KT)
Keywords	Addition Injection molding Powder metallurgy Rhenium alloys Sintering Tungsten alloys Density Ductility Elongation Grain size Hardening Hardness Liquid phases Physical properties Mixing Nets Powders Reduction Reprints Shape Solid solutions Solutions(Mixtures)
Source Agency	Army Non Paid Reprints
NTIS Subject Category	71P - Refractory Metals & Alloys
Corporate Authors	Rensselaer Polytechnic Inst., Troy, NY. Dept. of Materials Engineering.; Army Research Office, Research Triangle Park, NC.
Supplemental Notes	Pub. in Powder Metallurgy International, v20 n3 p9-13 1989.
Document Type	Journal Article
NTIS Issue Number	198923
Contract Number	DAAL03-87-K-0072