NDLI: Ancient Metal Mirror Alloy Revisited: Quasicrystalline Nanoparticles Observed

Content Provider	Springer Nature Link
Author	Sekhar, J. A. Mantri, A. S. Yamjala, S. Saha, Sabyasachi Balamuralikrishnan, R. Rao, P. Rama
Copyright Year	2015
Abstract	This article presents, for the first time, evidence of nanocrystalline structure, through direct transmission electron microscopy (TEM) observations, in a Cu-32 wt.% Sn alloy that has been made by an age-old, uniquely crafted casting process. This alloy has been used as a metal mirror for centuries. The TEM images also reveal five-sided projections of nano-particles. The convergent beam nano-diffraction patterns obtained from the nano-particles point to the nano-phase being quasicrystalline, a feature that has never before been reported for a copper alloy, although there have been reports of the presence of icosahedral ‘clusters’ within large unit cell intermetallic phases. This observation has been substantiated by x-ray diffraction, wherein the observed peaks could be indexed to an icosahedral quasi-crystalline phase. The mirror alloy casting has been valued for its high hardness and high reflectance properties, both of which result from its unique internal microstructure that include nano-grains as well as quasi-crystallinity. We further postulate that this microstructure is a consequence of the raw materials used and the manufacturing process, including the choice of mold material. While the alloy consists primarily of copper and tin, impurity elements such as zinc, iron, sulfur, aluminum and nickel are also present, in individual amounts not exceeding one wt.%. It is believed that these trace impurities could have influenced the microstructure and, consequently, the properties of the metal mirror alloy.
Starting Page	2976
Ending Page	2983
Page Count	8
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	67
Issue Number	12
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2015-07-14
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The ancient brass cementation processes revisited by extensive experimental simulation

Metal Injection Molding of Alloy 718 for Aerospace Applications

Alloy Design Criteria for Solid Metal Dealloying of Thin Films

Modeling of alloy casting solidification

Embedded Binary Eutectic Alloy Nanostructures

Precipitation Simulation of AZ91 Alloy

Alloy 718 for Oilfield Applications

Characterization of an Aluminum Alloy Hemispherical Shell Fabricated via Direct Metal Laser Melting

The Influence of ScF$_{3}$ Nanoparticles on the Physical and Mechanical Properties of New Metal Matrix Composites Based on A356 Aluminum Alloy

Ancient Metal Mirror Alloy Revisited: Quasicrystalline Nanoparticles Observed

Similar Documents

The ancient brass cementation processes revisited by extensive experimental simulation

Metal Injection Molding of Alloy 718 for Aerospace Applications

Alloy Design Criteria for Solid Metal Dealloying of Thin Films

Modeling of alloy casting solidification

Embedded Binary Eutectic Alloy Nanostructures

Precipitation Simulation of AZ91 Alloy

Alloy 718 for Oilfield Applications

Characterization of an Aluminum Alloy Hemispherical Shell Fabricated via Direct Metal Laser Melting

The Influence of ScF$_{3}$ Nanoparticles on the Physical and Mechanical Properties of New Metal Matrix Composites Based on A356 Aluminum Alloy

Ancient Metal Mirror Alloy Revisited: Quasicrystalline Nanoparticles Observed