The creep behavior of refractory metal alloysScienceDirect
Jan 01 2000 · Creep behavior of refractory alloys in ultrahigh vacuum. In Recent advances in refractory alloys for space power systems NASA SP-245 1970. p. 75–126 Google Scholar
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CREEP BEHAVIOR OF REFRACTORY ALLOYS IN ULTRAHIGH
ULTRAHIGH-VACUUM CREEP BEHAVIOR OF COLUMBIUM AND TANTALUM ALLOYS AT 2000 AND 2200 deg F FOR TIMES GREATER THAN 1000 HOURS. Technical Report Titran R H Hall R W. CREEP PROPERTIES OF REFRACTORY METAL ALLOYS IN ULTRAHIGH VACUUM. Journal Article Sawyer J C Steigerwald E AJ. Mater. 2 341-61 (June 1967).
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The High Temperature Tensile and Creep Behaviors of High
Oct 04 2017 · The 982 °C creep curve of HESA is clearly shown in Fig. 5(b) and there is no obvious primary creep with gradual increase in creep strain rate corresponding to an extensive tertiary creep behavior.
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Influence of Ingot and Powder Metallurgy Production Route
Nov 13 2017 · Refractory metals and their alloys show potential for high temperature applications due to the elevated melting points often paired with very good creep resistance.
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Creep Behavior of Ir-Nb-Ni Two-phase Refractory Superalloy
The compression properties and creep behaviors of the Ni added Ir 8 5 Nb 1 5 alloys were investigated by compression tests in air and vacuum. X-ray diffraction transmission microscopy and scanning electron microscopy were conducted to characterize the microstructure and lattice misfit change by the addition of Ni in Ir85Nb15 alloy.
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A study of creep behavior in refractory alloys for
Apr 28 2008 · The creep behavior of HfC strengthened tungsten alloys was studied. An ultrahigh vacuum high precision creep test system was constructed for this purpose so that the samples could be heated up to 3000 K for heat treatment and creep strain could be measured from the creep sample inside the vacuum chamber. Creep tests were conducted in tungsten strengthened with 0.37 percent
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Creep Behavior of Ir-Nb-Ni Two-phase Refractory Superalloy
The compression properties and creep behaviors of the Ni added Ir 8 5 Nb 1 5 alloys were investigated by compression tests in air and vacuum. X-ray diffraction transmission microscopy and scanning electron microscopy were conducted to characterize the microstructure and lattice misfit change by the addition of Ni in Ir85Nb15 alloy.
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Creep behavioror the material s ability to withstand forces under ultrahigh temperaturesis an important factor since increased temperatures and pressures lead to creep deformation. Understanding the material s creep can help engineers construct efficient heat engines that can withstand the extreme temperature environments.
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Creep Behavior of Ir-Nb-Ni Two-phase Refractory Superalloy
The compression properties and creep behaviors of the Ni added Ir 8 5 Nb 1 5 alloys were investigated by compression tests in air and vacuum. X-ray diffraction transmission microscopy and scanning electron microscopy were conducted to characterize the microstructure and lattice misfit change by the addition of Ni in Ir85Nb15 alloy.
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Development and exploration of refractory high entropy
The alloys were produced by vacuum arc melting and had a dendritic structure with dendrites enriched in Mo and W and interdendrites enriched in Co and Ni. Scott and Miracle 7 The ultrahigh strength of the SPS alloy is explained by the operation of four commercially available refractory alloys. Typically this behavior is associated with
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Sep 28 2018 · Creep behavior—or the material s ability to withstand forces under ultrahigh temperatures—is an important factor since increased temperatures and pressures lead to creep
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The High Temperature Tensile and Creep Behaviors of High
Oct 04 2017 · The 982 °C creep curve of HESA is clearly shown in Fig. 5(b) and there is no obvious primary creep with gradual increase in creep strain rate corresponding to an extensive tertiary creep behavior.
Get PriceMetals Special Issue Creep Behavior of Metals and Alloys
Although creep in metals and alloys has been intensively studied for 80 years our understanding remains largely phenomenological and incapable of making a priori predictions about component-scale behavior particularly in novel or complex alloys. Creep resistance remains a limiting property in many applications of the transportation and energy
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Creep behavior of refractory metal alloys
Ultrahigh vacuum creep tests were conducted on tantalum tungsten and molybdenum alloys to develop creep data and to evaluate the influence of liquid lithium exposure on the creep behavior
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Ultrahigh-temperature tensile creep of TiC
Scientific Reports In this study the ultrahigh-temperature tensile creep behaviour of a TiC-reinforced Mo-Si-B-based alloy was investigated in the temperature range of 1400–1600 °C at constant true stress.
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A study of creep behavior in refractory alloys for
The creep behavior of HfC strengthened tungsten alloys was studied. An ultrahigh vacuum high precision creep test system was constructed for this purpose so that the samples could be heated up to 3000 K for heat treatment and creep strain could be measured from the creep sample inside the vacuum chamber.
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High Temperature Siliddes and Refractory Alloys
alloy 387 d.-h. hou and h.l. fraser part vi refractory alloys physical and mechanical metallurgy •refractory and silicide laves phases 395 james d. livingston influence of tungsten alloying additions on the mechanical properties and texture of tantalum 407 g.t. gray iii s.r. bingert s.i. wright and s.r. chen effect of intermetallic
Get PriceHigh Temperature Siliddes and Refractory Alloys
alloy 387 d.-h. hou and h.l. fraser part vi refractory alloys physical and mechanical metallurgy •refractory and silicide laves phases 395 james d. livingston influence of tungsten alloying additions on the mechanical properties and texture of tantalum 407 g.t. gray iii s.r. bingert s.i. wright and s.r. chen effect of intermetallic
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A high-entropy alloy with hierarchical nanoprecipitates
High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths often greater than 1 GPa however the tensile strengths of most reported HEAs are limited. Here we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths.
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IAMMaterials Science and EngineeringResearchPhysical
This study presents novel Mo-Si-Ti alloys with the so far best achieved combination of oxidation and creep resistance among Mo-Si-based alloy systems. The dilemma of a high Ti vs. high Mo content and thus oxidation vs. creep resistance is resolved by profiting from a
Get PriceStudies on Creep and Wear Behavior of Mo-40Ti-10Si Alloy
The present study deals with the development and characterization of a Mo-Ti-Si alloy by pressure-assisted sintering for high-temperature applications. The three-phase alloy was found to be consisted of (Mo Ti)3Si-type silicide and discontinuous Mo-rich and Ti-rich α-(Mo Ti)ss phases. The alloy was characterized for mechanical properties creep and wear behavior.
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High-Entropy Alloys
Nickel Alloys (Superalloys) Able to withstand higher temperatures than Ti alloys High strength Good fatigue and creep resistance Good corrosion and oxidation resistance − High density 29 Application of alloy 718 in GE aircraft engines past present and next ve years Superalloys 718 625 706 and various derivatives
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Metals Special Issue Creep Behavior of Metals and Alloys
Although creep in metals and alloys has been intensively studied for 80 years our understanding remains largely phenomenological and incapable of making a priori predictions about component-scale behavior particularly in novel or complex alloys. Creep resistance remains a limiting property in many applications of the transportation and energy
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The High Temperature Tensile and Creep Behaviors of High
Oct 04 2017 · The 982 °C creep curve of HESA is clearly shown in Fig. 5(b) and there is no obvious primary creep with gradual increase in creep strain rate corresponding to an extensive tertiary creep behavior.
Get PriceCompressive Strength and Creep Properties of Ir-Nb-Zr
2073 K. However the ternary alloys showed great improvement on creep at 2073 K. The time for the 2 pct creep strain of the Ir-Nb-Zr alloy was about 100 hours while it was 1 hour for the binary alloys. The deformation mechanisms for compressive strength and creep resistance in these Ir-Nb-Zr alloys are discussed in terms of the deformation
Get PriceResearch NewsResearchers identify a metal that
Creep behavioror the material s ability to withstand forces under ultrahigh temperaturesis an important factor since increased temperatures and pressures lead to creep deformation. Understanding the material s creep can help engineers construct efficient heat engines that can withstand the extreme temperature environments.
Get Price
Creep properties of refractory metal alloys in ultrahigh
Abstract. Refractory metal alloys tested in ultrahigh vacuum measuring creep extensio
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New Applications and Novel Processing of Refractory Metal
New Applications and Novel Processing of Refractory Metal Alloys C.L. Briant Division of Engineering Brown University Providence Rl 02912 USA This result on the creep behavior of Cr-Ta alloys underscores the importance of alloy architecture in determining creep vacuum melting techniques. These have recently been reviewed by Moser
Get PriceNASA TECHNICAL NOTE NASA TN D-3222
ULTRAHIGH-VACUUM CREEP BEHAVIOR OF COLUMBIUM AND TANTALUM ALLOYS AT 2000° AND 2200° F FOR TIMES GREATER THAN 1000 HOURS by Robert H. Titran and Robert W. Hall Lewis Research Center SUMMARY Creep tests of 1000 hours and greater were conducted at 2000 and 2200 F on six commercially available refractory alloys at pressures of to lo- torr. The
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