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Pulsed Laser Ablation Deposition of Intermetallic Thin Films: A Study of Evolution of Metastable Phases and Ultra-fine Microstructures

Electronic Theses of Indian Institute of Science

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Title Pulsed Laser Ablation Deposition of Intermetallic Thin Films: A Study of Evolution of Metastable Phases and Ultra-fine Microstructures
 
Creator Bysakh, Sandip
 
Subject Metallurgy
Laser Ablation
Intermetallic
Metastable Phases
Ultra-fine Microstructures
Thin Films
 
Description This thesis is devoted to the deposition of intermetallic thin films by laser ablation deposition (LAD) and their characterization. Pulsed laser ablation and subsequent deposition of the ablated vapours produces films under conditions very far away from equilibrium. Besides the film, which forms directly by quenching the vapour or plasma on substrate, one also obtains under certain conditions micron and sub-micron sized spherical droplets of alloy melt on to the film. The latter travel at very high velocities and impinge on the substrate resulting in a very high rate of heat transfer during solidification from liquid state. Therefore, in this work it was possible to study the microstructure evolution depending on quenching rates of different sized droplets and compare with the extreme case of vapour/plasma quenching.

The compositions selected correspond to the intermetallic compounds in Al-Fe, Al-Ni and Ti-Si binary systems. Pre-alloyed targets of the appropriate intermetallic compositions were used for ablation by laser. The deposition system has been designed and built in-house. The
characterization is mainly done by transmission electron microscopy (TEM). The study focuses on microstructure and phase evolution within these intermetallic films at room temperature, at elevated temperature and during heating the room temperature deposited films in heating stage inside the TEM.
 
Publisher Indian Institute of Science
 
Contributor Chattopadhyay, Kamanio
Das, Pushpendu Kumar
 
Date 2005-07-27T09:10:01Z
2005-07-27T09:10:01Z
2005-07-27T09:10:01Z
2001-01
 
Type Electronic Thesis and Dissertation
 
Format 749524 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/135
null
 
Language en
 
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