Accession Number:

ADA516834

Title:

Engineered Nanostructures for Optimal Strength and Toughness

Descriptive Note:

Final rept. 8 Sep 2008-25 Mar 2010

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS

Personal Author(s):

• Gerberich, William

Report Date:

2009-08-10

Pagination or Media Count:

5.0

Abstract:

The goal of this proposed work was to develop engineered nanostructures that could have extremely hard properties but yet adequate toughness approaching 20 MPa-m12 to prevent fracture. In the first year 2008-2009 of this work, understanding of both the necessary and limiting factors have been developed. Progress towards both high hardness and high toughness are reported along with appropriate metrics of publications and presentations. Optimal Strength and Limitations We now have an understanding of those parameters which control hardness and strength of nanoparticles and nanopillars made of nominally brittle oxides or semiconductors such as sapphire and silicon.

Descriptors:

• *NANOSTRUCTURES
• *TOUGHNESS
• *STRENGTH(GENERAL)
• MATERIALS
• SEMICONDUCTORS
• FRACTURE(MECHANICS)
• SAPPHIRE
• BRITTLENESS
• ENGINEERING
• SILICON
• HARDNESS
• STRUCTURAL PROPERTIES
• NANOPARTICLES
• OPTIMIZATION
• PARAMETERS

Subject Categories:

• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE