Effect of test temperature on the dynamical torsional deformation behavior of two aluminium-lithium alloys

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0127-9· OSTI ID:611579

Lee, C G ^[1]; Kim, K J; Lee, S ^[2]; Cho, K ^[3]

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1. Korea Inst. of Machinery and Materials, Changwon (Korea, Republic of). Materials Engineering Dept.
2. Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advanced Aerospace Materials
3. Pusan National Univ. (Korea, Republic of). Dept. of Metallurgical Engineering

The objective of the present study is to investigate the effect of test temperature on the dynamic torsional deformation behavior of two Al-Li alloys, i.e., 2090 and 8090 alloys. Dynamic torsional tests were conducted using a torsional Kolsky bar at room temperature and a low temperature ({minus}196 C), and the torsionally deformed regions and the fracture surfaces of the tested specimens were examined. The dynamic properties of the two Al-Li alloys at the low temperature were improved, owing to the modification of the deformation behavior. The dynamic deformation behavior at room temperature was dominated by intergranular cracks due to planar slips and by crack propagation along the grain boundaries. At the low temperature, plastic deformation proceeded more homogeneously as planar slip was prevented. These results indicated that the overall deformation mode of both the Al-Li alloys changed from planar slip to homogeneous deformation with decreasing temperature, resulting in the improvement of cryogenic properties under dynamic torsional loading.

• Sponsoring Organization: USDOE
• OSTI ID: 611579
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 2 Vol. 29; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CRACK PROPAGATION
DEFORMATION
DYNAMIC LOADS
LITHIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
TEMPERATURE DEPENDENCE