CORRELATION OF DYNAMIC TORSIONAL PROPERTIES WITH ADIABATIC SHEAR BANDING BEHAVIOR IN BALLISTICALLY IMPACTED ALUMINUM-LITHIUM ALLOYS

Authors
Citation
Cg. Lee et S. Lee, CORRELATION OF DYNAMIC TORSIONAL PROPERTIES WITH ADIABATIC SHEAR BANDING BEHAVIOR IN BALLISTICALLY IMPACTED ALUMINUM-LITHIUM ALLOYS, Metallurgical and materials transactions. A, Physical metallurgy andmaterials science, 29(1), 1998, pp. 227-235
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Metallurgy & Metallurigical Engineering","Material Science
ISSN journal
1073-5623
Volume
29
Issue
1
Year of publication
1998
Pages
227 - 235
Database
ISI
SICI code
1073-5623(1998)29:1<227:CODTPW>2.0.ZU;2-S
Abstract
The present study is concerned with a correlation between dynamic defo rmation properties obtained from the dynamic Kolsky bar test with the adiabatic shear banding behavior developed in Al-Li alloys upon ballis tic impact, and then with the ballistic performance. The selected mate rials were a 2090 Al-Li alloy, a WELDALITE 049 alloy, and a 7039 Al al loy, to allow a comparative study of different strengths and microstru ctures. After the ballistic impact testing, the amount and the distrib ution of adiabatic shear bands were examined using optical and scannin g electron microscopes. In the front side of the impacted area, many t hin delaminated sheets and a large amount of fragmentation were observ ed in the 2090 alloy and the WELDALITE alloy, respectively. Near the i mpacted region, a large amount of plastic flow also existed, and adiab atic shear bands were hardly observed in the 2090 and the WELDALITE al loys, whereas they easily formed in the 7039 alloy. Since adiabatic sh ear bands usually deteriorate the impact resistance of target material s, the ballistic performance of each alloy was discussed by comparing the adiabatic shear banding behavior with microstructure, strength lev el, and dynamic torsional properties.