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Book Chapter

By Kenneth H. Eckelmeyer, Steven G. Caldwell
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003166
EISBN: 978-1-62708-199-3
... density materials: depleted uranium and tungsten and their alloys. applications depleted uranium design considerations health considerations mechanical properties metallurgy processing tungsten tungsten alloys uranium alloys very high density metals VERY HIGH DENSITY METALS are used...
Book Chapter

By Awadh B. Pandey
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003371
EISBN: 978-1-62708-195-5
... Abstract Metallic matrices are essential constituents for the fabrication of metal-matrix composites (MMCs). This article describes three different classes of aluminum alloys, namely, commercial aluminum alloys, low-density and high-modulus alloys, and high temperature alloys. It presents...
Book Chapter

By Kristen M. Kearns
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003478
EISBN: 978-1-62708-195-5
..., reasonable strength and stiffness, and low density. Corrosion is not a concern at temperatures below 370 °C (700 °F). The higher-temperature heat exchangers are typically fabricated from very heavy metallic materials. The weight savings and high thermal conductivity of carbon-carbon offers the payoff...
Book Chapter

By Erhard Klar
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003185
EISBN: 978-1-62708-199-3
... in P/M products: from very low-density metallic forms to low- and medium-density filters and self-lubricating bearings, and high- and full-density structural parts. In the most widely employed technique, powders are compacted into green parts at room temperature...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006258
EISBN: 978-1-62708-169-6
... properties metal-matrix composites microstructure Introduction Magnesium-matrix composites are very promising as structural materials because of their low density, high specific strength, and excellent castability. Magnesium alloys are currently the lightest-weight structural alloys available...
Book Chapter

By Jim Kindinger
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003375
EISBN: 978-1-62708-195-5
... only with steel and specialty metal honeycomb materials, which are usually used in high-temperature applications. The extrusion process is used with ceramic honeycomb and a few thermoplastic honeycombs. Honeycomb Cell Technology The honeycomb industry has its own terminology to define...
Book Chapter

By Prasan K. Samal
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006142
EISBN: 978-1-62708-175-7
... molding (MIM) process. In comparison to conventional PM, MIM uses much finer metal powders (or ceramic powders) in combination with very high sintering temperature. Metal injection molding is most suitable for the manufacture of small and intricate components. See the division on “Metal Injection Molding...
Book Chapter

By Howard I. Sanderow
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002486
EISBN: 978-1-62708-194-8
... to high-volume products such as automotive connecting rods and transmission components as well as power tool parts Mechanical properties equivalent to wrought steel Most cost-competitive of the full-density processes for medium-to-large parts Metal injection molding: Metal injection molding...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006087
EISBN: 978-1-62708-175-7
... of these metals are very high. Reduction processes, which use hydrogen as the reducing medium, are similar for both tungsten and molybdenum oxides. For molybdenum trioxide, however, reduction is performed in two stages to control particle size. Due to the high vapor presence of molybdenum trioxide, the first step...
Book Chapter

By Peter E. Price
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006074
EISBN: 978-1-62708-175-7
... of a high-pressure flow-control valve in the overall system. A depressurization schedule that avoids part cracking should be determined experimentally. Evaluation Evaluation of green strength and density of a cold isostatically pressed part may be carried out for a given metal powder and process...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006125
EISBN: 978-1-62708-175-7
... for a given application is typically made on the basis of very high density, whether gravimetric or radiographic. WHAs are the preferred form of tungsten for most mass/density related requirements in that large components can be easily fabricated from compacted elemental metal powders by the conventional...
Book Chapter

By Bo Hu
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006102
EISBN: 978-1-62708-175-7
... if it is equipped with an energy-dispersive x-ray spectrometer (EDS). Compared to optical scopes, the SEM provides high-resolution images and can present the details of particle morphology ( Fig. 1 ). This article provides brief examples of particle image analysis on metal powders used in the PM industry. Fig...
Book Chapter

By Bo Hu
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006100
EISBN: 978-1-62708-175-7
... on the vertical stack of discs to reach the desired sintered density level and to prevent warpage or distortion. However, excess pressure causes high sintered densities and loss of low-melting-point metals from the friction material. Sintering is carried out at temperatures of 550 to 1000 °C (1020 to 1830 °F...
Book Chapter

By Thomas W. Eagar
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001332
EISBN: 978-1-62708-173-3
... broad and deep training is required to bring these disciplines together and to apply them effectively to a variety of processes. Second, welding or joining difficulties usually occur far into the manufacturing process, where the relative value of scrapped parts is high. Third, a very large...
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003358
EISBN: 978-1-62708-195-5
... reactivity in molten metal baths (casting) and are relativity low-cost. The resultant composite properties, such as stiffness, strength, and fracture toughness, are not as high as those of either the SiC or B 4 C reinforcement. However, the low reactivity and low cost make this reinforcement very attractive...
Book Chapter

By Chris Schade, John J. Dunkley
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006084
EISBN: 978-1-62708-175-7
... Packing densities range from as high as 65% of solid for spherical powders such s inert gas, ultrasonic, and centrifugally atomized powders frozen in inert gas, to as low as 20% for some alloys prone to oxidation or very rapid freezing in water atomization. Purity The concept of purity covers...
Book Chapter

By W. Brian James
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006022
EISBN: 978-1-62708-175-7
... parts with high relative densities. Some metal powders are not very compressible. The powder particles are hard and have limited plasticity. Rigid die compaction is not suitable for consolidating such powders, and they must be processed by other means such as hot pressing, extrusion, or hot...
Book Chapter

By Peter A. dePoutiloff, Prasan K. Samal
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006118
EISBN: 978-1-62708-175-7
... exhaust applications are sintered at a high temperature in a 100% hydrogen atmosphere. Since reduction of carbon via reaction with the oxygen present in the powder is rapid at high temperatures, significant reduction is achieved in carbon content. High-density PM ferritic components, with their very low...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006097
EISBN: 978-1-62708-175-7
... a highly irregular morphology, with a low apparent density (AD) of approximately 2.4 g/cm 3 (unlubed). On the other end of the spectrum, for operations that employ very high compacting pressures, powders can be made with a more rounded particle morphology exhibiting an AD of 3.0 g/cm 3 (unlubed...
Book Chapter

By R. Alan Patterson
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001351
EISBN: 978-1-62708-173-3
... (for example, copper) Recrystallization and recovery have been observed in bands on both sides of high-dislocation-density regions ( Ref 29 ) Very little diffusion occurs across the bond interface ( Ref 29 ) These observations support the hypothesis that says that wave formation is a result...