Deformation behavior and microstructure of DS NiAl/Cr(Mo)alloy containing Hf

Cui, Chao; Qi, Yi; Ye, H.Q.

doi:10.1016/s0966-9795(02)00124-3

Cited by 25 publications

(10 citation statements)

References 23 publications

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“…This phenomenon has been observed by many authors. [22][23][24][25] In summary, the microstructure and mechanical properties of NiAl-8Cr-3.5Nb alloy prepared by rapid solidification processing, i.e. copper mold injection casting were systemically investigated in this study.…”

Section: Resultsmentioning

confidence: 99%

Compressive Mechanical Properties of NiAl/Cr(Nb) Alloy Prepared by Rapid Solidification Processing

Huang

2007

Adv Eng Mater

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Inadequate strength at elevated temperatures and low fracture toughness at ambient temperatures are the major deficiencies preventing the B2 aluminide NiAl as an advanced structural material used at high temperatures. In this study, an IP alloy with the composition of NiAl‐Cr/Nb alloy was chosen and prepared by injection casting, and its microstructural morphology and mechanical properties were investigated. The compression testing results demonstrate that the resultant alloy exhibits improved compressive ductility and yield strength at room temperature as compared with that of the same alloy prepared by conventional ingot casting.

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Section: Resultsmentioning

confidence: 99%

Compressive Mechanical Properties of NiAl/Cr(Nb) Alloy Prepared by Rapid Solidification Processing

Huang

2007

Adv Eng Mater

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“…The volume fraction of Heusler phase determined by a Kontron IPS 500 system is about 4 pct. These results are different from the NiAl/Cr(Mo)-0.1Hf alloy, [11] which is composed of NiAl, Cr(Mo), and small amount of Hf precipitate. As shown in Figure 1(b), microstructure of the longitudinal direction is characterized by a lamellar morphology that is generally aligned parallel to the growth direction and embedded within the NiAl matrix.…”

Section: As-grown Statementioning

confidence: 60%

Investigation of a directionally solidified NiAl/Cr(Mo) composite alloyed with Hf

Cui

Guo

et al. 2003

Metall Mater Trans A

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A NiAl/Cr(Mo) composite alloyed with Hf was directionally solidified under a Ar atmosphere in Al 2 O 3 -SiO 2 mold by the standard Bridgman technique. The as-grown composite was composed of NiAl matrix, lamellar Cr(Mo), and semicontinuously distributed Ni 2 AlHf. The G phase (Ni 16 Hf 6 Si 7 ) formed in the presence of Si, which was a contamination resulting from the ceramic mold. The interfaces were atomically flat with no transition layer. After hot isostatic pressing (hipping) and aging treatment, the G phase completely disappeared and the amount of intercellular Ni 2 AlHf phase was partially reduced. The compressive yield stress and tensile strength of the composite were higher than those of many NiAl-based alloys. Embrittlement existed at high temperatures, induced by hipping and aging. The effect of the G phase and Heusler phase on the mechanical property of the composite was also discussed.

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“…The appearance of the primary dendritic NiAl phase in the DS alloy indicates that the composition of the alloy is out of the coupled zone. This phenomenon also existed in both DS NiAle28Cre5.6Moe0.1Hf and DS Nie35.6Ale30Cre2.8Moe0.2Hf [19,20]. Misra et al even found more than 40% dendritic microstructure in DS.…”

Section: Microstructurementioning

confidence: 95%

Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho

Jianting¹,

Xie²,

Sheng³

et al. 2011

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Deformation behavior and microstructure of DS NiAl/Cr(Mo)alloy containing Hf

Cited by 25 publications

References 23 publications

Compressive Mechanical Properties of NiAl/Cr(Nb) Alloy Prepared by Rapid Solidification Processing

Compressive Mechanical Properties of NiAl/Cr(Nb) Alloy Prepared by Rapid Solidification Processing

Investigation of a directionally solidified NiAl/Cr(Mo) composite alloyed with Hf

Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho

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