Microstructures of LENS™ deposited Nb-Si alloys

Ryan R. Dehoff; Peter M. Sarosi; Peter C. Collins; Hamish L. Fraser; Michael J. Mills

Microstructures of LENS™ deposited Nb-Si alloys

Ryan R. Dehoff, Peter M. Sarosi, Peter C. Collins, Hamish L. Fraser, Michael J. Mills

Research output: Contribution to journal › Conference article › peer-review

3 Scopus citations

Abstract

Nb-Si "in-situ" metal matrix composites consist of Nb ₃Si and Nb₅Si₃ intermetallic phases in a body centered cubic Nb solid solution, and show promising potential for elevated temperature structural applications. Cr and Ti have been shown to increase the oxidation resistance and metal loss rate at elevated temperatures compared to the binary Nb-Si system. In this study, the LENS™ (Laser Engineered Net Shaping) process is being implemented to construct the Nb-Ti-Cr-Si alloy system from elemental powder blends. Fast cooling rates associated with LENS™ processing yield a reduction in microstructural scale over conventional alloy processes such as directional solidification. Other advantages of LENS™ processing include the ability to produce near net shaped components with graded compositions as well as a more uniform microstructure resulting from the negative enthalpy of mixing associated with the suicide phases. Processing parameters can also be varied, resulting in distinct microstructural differences. Deposits were made with varying compositions of Nb, Ti, Cr and Si. The as-deposited as well as heat treated microstructures were examined using SEM and TEM techniques. The influence of composition and subsequent heat treatment on microstructure will be discussed.

Original language	English
Article number	S2.11
Pages (from-to)	285-290
Number of pages	6
Journal	Materials Research Society Symposium Proceedings
Volume	842
State	Published - 2005
Externally published	Yes
Event	2004 MRS Fall Meeting - Boston, MA, United States Duration: Nov 29 2004 → Dec 3 2004

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title = "Microstructures of LENS{\texttrademark} deposited Nb-Si alloys",

abstract = "Nb-Si {"}in-situ{"} metal matrix composites consist of Nb 3Si and Nb5Si3 intermetallic phases in a body centered cubic Nb solid solution, and show promising potential for elevated temperature structural applications. Cr and Ti have been shown to increase the oxidation resistance and metal loss rate at elevated temperatures compared to the binary Nb-Si system. In this study, the LENS{\texttrademark} (Laser Engineered Net Shaping) process is being implemented to construct the Nb-Ti-Cr-Si alloy system from elemental powder blends. Fast cooling rates associated with LENS{\texttrademark} processing yield a reduction in microstructural scale over conventional alloy processes such as directional solidification. Other advantages of LENS{\texttrademark} processing include the ability to produce near net shaped components with graded compositions as well as a more uniform microstructure resulting from the negative enthalpy of mixing associated with the suicide phases. Processing parameters can also be varied, resulting in distinct microstructural differences. Deposits were made with varying compositions of Nb, Ti, Cr and Si. The as-deposited as well as heat treated microstructures were examined using SEM and TEM techniques. The influence of composition and subsequent heat treatment on microstructure will be discussed.",

author = "Dehoff, {Ryan R.} and Sarosi, {Peter M.} and Collins, {Peter C.} and Fraser, {Hamish L.} and Mills, {Michael J.}",

year = "2005",

language = "English",

volume = "842",

pages = "285--290",

journal = "Materials Research Society Symposium Proceedings",

issn = "0272-9172",

note = "2004 MRS Fall Meeting ; Conference date: 29-11-2004 Through 03-12-2004",

}

TY - JOUR

T1 - Microstructures of LENS™ deposited Nb-Si alloys

AU - Dehoff, Ryan R.

AU - Sarosi, Peter M.

AU - Collins, Peter C.

AU - Fraser, Hamish L.

AU - Mills, Michael J.

PY - 2005

Y1 - 2005

N2 - Nb-Si "in-situ" metal matrix composites consist of Nb 3Si and Nb5Si3 intermetallic phases in a body centered cubic Nb solid solution, and show promising potential for elevated temperature structural applications. Cr and Ti have been shown to increase the oxidation resistance and metal loss rate at elevated temperatures compared to the binary Nb-Si system. In this study, the LENS™ (Laser Engineered Net Shaping) process is being implemented to construct the Nb-Ti-Cr-Si alloy system from elemental powder blends. Fast cooling rates associated with LENS™ processing yield a reduction in microstructural scale over conventional alloy processes such as directional solidification. Other advantages of LENS™ processing include the ability to produce near net shaped components with graded compositions as well as a more uniform microstructure resulting from the negative enthalpy of mixing associated with the suicide phases. Processing parameters can also be varied, resulting in distinct microstructural differences. Deposits were made with varying compositions of Nb, Ti, Cr and Si. The as-deposited as well as heat treated microstructures were examined using SEM and TEM techniques. The influence of composition and subsequent heat treatment on microstructure will be discussed.

AB - Nb-Si "in-situ" metal matrix composites consist of Nb 3Si and Nb5Si3 intermetallic phases in a body centered cubic Nb solid solution, and show promising potential for elevated temperature structural applications. Cr and Ti have been shown to increase the oxidation resistance and metal loss rate at elevated temperatures compared to the binary Nb-Si system. In this study, the LENS™ (Laser Engineered Net Shaping) process is being implemented to construct the Nb-Ti-Cr-Si alloy system from elemental powder blends. Fast cooling rates associated with LENS™ processing yield a reduction in microstructural scale over conventional alloy processes such as directional solidification. Other advantages of LENS™ processing include the ability to produce near net shaped components with graded compositions as well as a more uniform microstructure resulting from the negative enthalpy of mixing associated with the suicide phases. Processing parameters can also be varied, resulting in distinct microstructural differences. Deposits were made with varying compositions of Nb, Ti, Cr and Si. The as-deposited as well as heat treated microstructures were examined using SEM and TEM techniques. The influence of composition and subsequent heat treatment on microstructure will be discussed.

UR - http://www.scopus.com/inward/record.url?scp=23844523504&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:23844523504

SN - 0272-9172

VL - 842

SP - 285

EP - 290

JO - Materials Research Society Symposium Proceedings

JF - Materials Research Society Symposium Proceedings

M1 - S2.11

T2 - 2004 MRS Fall Meeting

Y2 - 29 November 2004 through 3 December 2004

ER -

Microstructures of LENS™ deposited Nb-Si alloys

Abstract

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