Microstructural and crystallographic relationships in directionally solidified NbCr2Nb and CrCr2Nb eutectics

Bewlay, B. P.; Sutliff, J. A.; Jackson, M. R.; Lipsitt, H. A.

doi:10.1016/0956-7151(94)90228-3

Cited by 56 publications

(25 citation statements)

References 6 publications

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“…Bewlay et al [18] report a fracture toughness of 3. of the crack tip, indicating similar deformation behav ior as the two-phase bcc+TiCr 2 alloys.…”

Section: Fracture Toughnessmentioning

confidence: 99%

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Factors affecting the room-temperature mechanical properties of TiCr2-base Laves phase alloys

Chen

Allen

Livingston

1998

Materials Science and Engineering: A

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Various effects on the room-temperature mechanical properties of TiCr 2 -base alloys have been assessed in efforts to improve the toughness of Laves phase intermetallics (AB 2 ). Systematic studies were performed on: (i) single-phase stoichiometric and nonstoichiometric TiCr 2 , (ii) TiCr 2 -base ternary Laves phases, and (iii) two-phase binary alloys containing TiCr 2 . In order to make quantitative comparisons among the different alloys, Vickers indentation was used to obtain hardness and fracture toughness values. Within the single-phase field, constitutional defects accounted for the compositional dependencies of properties, and may aid the synchroshear deformation process. Ternary Laves phases comprised of Fe, Nb, V or Mo additions to TiCr 2 indicated that alloying elements which partition to both A and B sublattices can improve the toughness. Stabilization of the cubic C15 crystal structure also resulted in higher toughness values. Small amounts of the bcc �-phase effectively reduced crack lengths in the Laves phase, and two-phase alloys of (Ti,Cr) + TiCr 2 exhibited significant improvements in toughness.

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“…Bewlay et al [18] report a fracture toughness of 3. of the crack tip, indicating similar deformation behav ior as the two-phase bcc+TiCr 2 alloys.…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…Several two-phase Laves systems have been investigated, such as Nb+NbCr 2 [15,16], Cr +NbCr 2 [17][18][19], Fe+ NbFe 2 [20], Cr +HfCr 2 [21], and Fe+ ZrFe 2 alloys [11]. The Laves phase itself can experience some plastic deformation when contained within a large volume fraction of a second, more ductile phase [1].…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the room-temperature mechanical properties of TiCr2-base Laves phase alloys

Chen

Allen

Livingston

1998

Materials Science and Engineering: A

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“…In the Cr -Nb system, the as-cast single-phase alloy (Cr 2 Nb phase) exhibits the twinned C15 structure [9]. The C14 structure is still believed to be the stable hightemperature phase but the transformation from the C14 to C15 is thought to be rapid [9] and to proceed during cooling to room temperature.…”

Section: Experimental Observationsmentioning

confidence: 99%

“…The C14 structure is still believed to be the stable hightemperature phase but the transformation from the C14 to C15 is thought to be rapid [9] and to proceed during cooling to room temperature. Twinning is thought to be a consequence of the C14-to-C15 transformation.…”

Section: Experimental Observationsmentioning

confidence: 99%

Polytypic transformations in Laves phases

2004

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“…[1][2][3][4][5] Particularly, the Nb-base in-situ composites, which consist of the Nb solid solution (Nb SS ) and Nb-base compounds such as Nb 5 Si 3 , Nb 3 Si, Nb 3 Al, NbCr 2 , and (Nb,Ti)C, are considered to have a good potential for structural applications at elevated temperatures over the service range of Ni-base superalloys. [6][7][8][9][10][11][12] Our preceding studies concerning the mechanical properties of Nb SS /Nb 3 Al and Nb SS /Nb 5 Si 3 in-situ composites demonstrated that when Nb SS is strengthened by the solution effects of molybdenum and tungsten, the composites could be used at 1573 K and higher temperatures. [10,[13][14][15][16] However, disastrous oxidation of Nb-base materials at temperatures above 700 K remains a serious problem and impedes their practical use.…”

Section: Introductionmentioning

confidence: 99%

Development of Mo(Si,Al)2-base oxidation-resistant coating on Nb-base structural materials

Tabaru

Kim

Shobu

et al. 2005

Metall Mater Trans A

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base oxidation-resistant coatings for Nb-base structural materials have been studied. The coating is composed of a Mo(Si,Al) 2 -base Al reservoir and Al 2 O 3 interlayer to suppress interface reactions between the Al reservoir and the substrate. To develop a suitable Al-reservoir material, some Mo(Si 0.6 ,Al 0.4 ) 2 -HfB 2 composites were prepared. Their oxidation resistance and coefficients of thermal expansion were investigated, in addition to their chemical reactivity with the Nb substrate at high temperatures. As a result, Mo(Si 0.6 ,Al 0.4 ) 2 -20 vol pct HfB 2 was selected as one of the satisfactory Al reservoirs. The introduction of a stable Al 2 O 3 interlayer was attempted using a novel powder metallurgical process to overlay the Nb substrates with the Al reservoir, where the Nb substrates were subjected to a slight surface oxidation prior to the coating process. The Nb specimens, which are thoroughly coated with the Al reservoir and Al 2 O 3 interlayer, can be successfully fabricated by this method. The coated Nb specimens are not damaged at all after prolonged exposure in flowing Ar-20 pct O 2 at 1673 K for 120 hours. Furthermore, the Al 2 O 3 interlayer is very effective and no reactions occur at the interface. Thus, this Mo(Si,Al) 2 -base oxidation-resistant coating is applicable to Nb. The utility of the coating system is also confirmed for a Nb SS /Nb 5 Si 3 composite.

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Microstructural and crystallographic relationships in directionally solidified NbCr2Nb and CrCr2Nb eutectics

Cited by 56 publications

References 6 publications

Factors affecting the room-temperature mechanical properties of TiCr2-base Laves phase alloys

Factors affecting the room-temperature mechanical properties of TiCr2-base Laves phase alloys

Polytypic transformations in Laves phases

Development of Mo(Si,Al)2-base oxidation-resistant coating on Nb-base structural materials

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