"Magnesium alloys have been fast catching up their attention in applications where both lightweight and exceptional strength is desired. But magnesium alloys suffer formability issues which limit their use to cast applications when designing complicated shapes. Friction stir processing (FSP) is technique for, imparting a fine-grained, homogeneous microstructure by which both strength and ductility can be enhanced. The results from the first part of present work showed that AZ31 alloy when employed the use of FSP, yielded significant strength and ductility gains but on the cost of anisotropy. The cause of anisotropy was investigated to be correlated to texture evolution during FSP.
In the second part, the friction stir lap welding of two different magnesium alloys AZ91 to AM30 has been investigated. The study was aimed to investigate the best tool geometry to yield widest range of defect free parameters along with high strength in welded region. The objective of deciding the best tool geometry was achieved by utilizing hardness profiling of welded regions as well as using process maps for various tool designs. The weld strength of defect free runs was evaluated through mechanical tests; lap shear test and tensile test. The effect of post weld treatment on strength properties was also considered"--Abstract, page iv.
Mishra, Rajiv S.
Newkirk, Joseph William
Dharani, Lokeswarappa R.
Materials Science and Engineering
M.S. in Materials Science and Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Influence of texture on mechanical behavior of friction stirred processed magnesium alloy
- Characterization of Friction Stir Lap Welding of AZ91 magnesium alloy to AM30 magnesium alloy
xii, 61 pages
© 2009 Gaurav Bhargava, All rights reserved.
Thesis - Restricted Access
Library of Congress Subject Headings
Friction stir welding
Magnesium alloys -- Mechanical properties
Welded joints -- Fatigue
Strength of materials
Print OCLC #
Electronic OCLC #
Link to Catalog RecordElectronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b10158112~S5
Bhargava, Gaurav, "Friction stir processing of magnesium alloys" (2009). Masters Theses. 4485.