Masters Theses


Jing Zheng


"Aluminum alloys have been widely used in many industrial fields, but their high temperature properties limit their usage in heat sensitive applications. Nanophase aluminum alloy, a novel group of aluminum alloys, exhibit good mechanical properties at ambient temperature. It is deemed a potential high strength material at elevated temperatures.

In this study, two groups of nanophase aluminum alloys, Al-Ti-Cu and Al-Mg, were investigated. The aims of the study were to establish: (a) chemical composition and microstructure, (b) mechanical property at different temperatures, (c) microstructure- mechanical property correlation and (d) strengthening mechanisms.

Mini-tensile specimens were used to determine mechanical properties. Tensile tests were operated in the temperature range of 20 °C to 376 °C, at initial strain rates of 7 x 10-5 to 1 x 10-2 s-1. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) technique were used for microstructural studies.

The results show that the materials possess a good combination of strength and ductility at all test temperatures. The existence of very fine grain structure and nanometer size particles are responsible for excellent mechanical properties. Strengthening mechanisms are still not clear, and results do not follow the existing models"--Abstract, page iii.


Mishra, Rajiv S.

Committee Member(s)

Miller, F. Scott, 1956-
Dharani, Lokeswarappa R.


Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering


The funding provided by the Air Force Office of Scientific Research and materials provided by Rockwell Scientific Company and the Boeing Company are sincerely acknowledged.


University of Missouri--Rolla

Publication Date

Fall 2002


xi, 65 pages

Note about bibliography

Includes bibliographical references (pages 60-64).


© 2002 Jing Zheng, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Aluminum alloys -- Analysis

Thesis Number

T 8127

Print OCLC #


Link to Catalog Record

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