Microstructure evolution and nonequilibrium phase diagram for Ni-Hf binary alloy produced by laser cladding

S. Sircar, Jogender Singh, J. Mazumder

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Synthesis of nonequilibrium Ni-Hf binary alloys were carried out using laser cladding technique. In this process mixed powder in the ratio of Ni-26 wt% Hf was delivered using a screw feeder into a melt pool of the substrate, generated by a high power continuous wave CO2 laser beam. The microstructure of the claddings thus produced were investigated using optical, scanning and transmission electron microscopy and X-ray microanalysis techniques. Due to the inherent rapid cooling rate associated with the process of laser cladding process, some nonequilibrium hereto unreported phases formed in the claddings. There is also an extension in the solid solubility of Hf in the terminal α phase as compared to the equilibrium Ni-Hf binary phase diagram. This paper investigates this solid solubility extension, the evolution of the microstructure in the claddings in the system and also characterizes the metastable phases formed in terms of crystal structure and microchemistry. A nonequilibrium phase diagram for Ni-Hf binary alloy is recommended based on the micro-chemistry and differential thermal analysis data.

Original languageEnglish (US)
Pages (from-to)1167-1176
Number of pages10
JournalActa Metallurgica
Volume37
Issue number4
DOIs
StatePublished - Jan 1 1989

Fingerprint

Laser cladding
Binary alloys
Phase diagrams
Microstructure
Solubility
Continuous wave lasers
Metastable phases
High power lasers
Microanalysis
Light transmission
Powders
Differential thermal analysis
Laser beams
Crystal structure
Transmission electron microscopy
Cooling
Scanning
X rays
Scanning electron microscopy
Substrates

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{ccde583c7862446493e9f1ca53ba1e7a,
title = "Microstructure evolution and nonequilibrium phase diagram for Ni-Hf binary alloy produced by laser cladding",
abstract = "Synthesis of nonequilibrium Ni-Hf binary alloys were carried out using laser cladding technique. In this process mixed powder in the ratio of Ni-26 wt{\%} Hf was delivered using a screw feeder into a melt pool of the substrate, generated by a high power continuous wave CO2 laser beam. The microstructure of the claddings thus produced were investigated using optical, scanning and transmission electron microscopy and X-ray microanalysis techniques. Due to the inherent rapid cooling rate associated with the process of laser cladding process, some nonequilibrium hereto unreported phases formed in the claddings. There is also an extension in the solid solubility of Hf in the terminal α phase as compared to the equilibrium Ni-Hf binary phase diagram. This paper investigates this solid solubility extension, the evolution of the microstructure in the claddings in the system and also characterizes the metastable phases formed in terms of crystal structure and microchemistry. A nonequilibrium phase diagram for Ni-Hf binary alloy is recommended based on the micro-chemistry and differential thermal analysis data.",
author = "S. Sircar and Jogender Singh and J. Mazumder",
year = "1989",
month = "1",
day = "1",
doi = "10.1016/0001-6160(89)90112-0",
language = "English (US)",
volume = "37",
pages = "1167--1176",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
number = "4",

}

Microstructure evolution and nonequilibrium phase diagram for Ni-Hf binary alloy produced by laser cladding. / Sircar, S.; Singh, Jogender; Mazumder, J.

In: Acta Metallurgica, Vol. 37, No. 4, 01.01.1989, p. 1167-1176.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure evolution and nonequilibrium phase diagram for Ni-Hf binary alloy produced by laser cladding

AU - Sircar, S.

AU - Singh, Jogender

AU - Mazumder, J.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Synthesis of nonequilibrium Ni-Hf binary alloys were carried out using laser cladding technique. In this process mixed powder in the ratio of Ni-26 wt% Hf was delivered using a screw feeder into a melt pool of the substrate, generated by a high power continuous wave CO2 laser beam. The microstructure of the claddings thus produced were investigated using optical, scanning and transmission electron microscopy and X-ray microanalysis techniques. Due to the inherent rapid cooling rate associated with the process of laser cladding process, some nonequilibrium hereto unreported phases formed in the claddings. There is also an extension in the solid solubility of Hf in the terminal α phase as compared to the equilibrium Ni-Hf binary phase diagram. This paper investigates this solid solubility extension, the evolution of the microstructure in the claddings in the system and also characterizes the metastable phases formed in terms of crystal structure and microchemistry. A nonequilibrium phase diagram for Ni-Hf binary alloy is recommended based on the micro-chemistry and differential thermal analysis data.

AB - Synthesis of nonequilibrium Ni-Hf binary alloys were carried out using laser cladding technique. In this process mixed powder in the ratio of Ni-26 wt% Hf was delivered using a screw feeder into a melt pool of the substrate, generated by a high power continuous wave CO2 laser beam. The microstructure of the claddings thus produced were investigated using optical, scanning and transmission electron microscopy and X-ray microanalysis techniques. Due to the inherent rapid cooling rate associated with the process of laser cladding process, some nonequilibrium hereto unreported phases formed in the claddings. There is also an extension in the solid solubility of Hf in the terminal α phase as compared to the equilibrium Ni-Hf binary phase diagram. This paper investigates this solid solubility extension, the evolution of the microstructure in the claddings in the system and also characterizes the metastable phases formed in terms of crystal structure and microchemistry. A nonequilibrium phase diagram for Ni-Hf binary alloy is recommended based on the micro-chemistry and differential thermal analysis data.

UR - http://www.scopus.com/inward/record.url?scp=0024649602&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024649602&partnerID=8YFLogxK

U2 - 10.1016/0001-6160(89)90112-0

DO - 10.1016/0001-6160(89)90112-0

M3 - Article

VL - 37

SP - 1167

EP - 1176

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 4

ER -