On the Scaling of Fracture Toughness with Relative Density in Sintered Alumina (Record no. 14787)

MARC details
000 -LEADER
fixed length control field 02327nam a22001697a 4500
082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER
Classification number 620.112
Item number G977O
100 ## - MAIN ENTRY--AUTHOR NAME
Personal name Gupta, Sandeep Das
245 ## - TITLE STATEMENT
Title On the Scaling of Fracture Toughness with Relative Density in Sintered Alumina
Statement of responsibility, etc by Sandeep Das Gupta
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication IIT Jodhpur
Name of publisher Department of Metallurgical & Materials Engineering
Year of publication 2020
300 ## - PHYSICAL DESCRIPTION
Number of Pages xvi,39p.
Other physical details HB
520 ## - SUMMARY, ETC.
Summary, etc Among boron-rich solids boron carbide come third in hardness when compared to diamondlike structures and has been the subject of research in recent decades. They possess superior industrial manufacturability, low density, and high hardness as compared to other ceramics such as alumina and silicon carbide. Despite of these properties, an ordinary pernicious attribute called “pressure-induced softening", limits their performance in high-velocity projectile applications. This thesis highlights this characteristics of amorphized states of boron carbide, an ordinary icosahedral boron-rich ceramic, intending to understand the mechanistic layout of this softening. Shock studies of B4C have suggested phase transformation at high pressures, but to date, no convincing proof has been affirmative to prove the existence of new high-pressure phases. To help uncover the failure mechanism, we used methods based on ab-intio calculations to carry out a simulation on B11C-CBCp polytype, results of which is later compared to B12-CCC stoichiometric boron carbide. For structural characterization, we have calculated non-resonant Raman spectra, which has been evaluated using first-principles calculations considering the macroscopic view of Raman Spectra. Our simulation suggests that softening is the consequence of structural changes associated with the three-atom chain’s bending. Carefull analysis of the calculated Raman spectra suggested shifts in the peak position and intensity with the variation of pressure. Calculations of the elastic constants (Ci jkl) are also being carried out following a homogeneous deformation method, to understand its mechanical behaviour under pressure variation.<br/>
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Toughness with Relative Density in Sintered Alumina
Topical Term MTech Theses
Topical Term Department of Metallurgical & Materials Engineering
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name Bhattacharyya, Abir
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Thesis
Holdings
Withdrawn status Lost status Damaged status Not for loan Collection code Permanent Location Current Location Shelving location Date acquired Full call number Accession Number Price effective from Koha item type
      Not For Loan Reference S. R. Ranganathan Learning Hub S. R. Ranganathan Learning Hub Course Reserve 2024-02-05 620.112 G977O TM00201 2024-02-05 Thesis