The Stress and Temperature Dependence of Creep in an AL-2.0WT%LI Alloy
Abstract
The effect of stress and temperature on the creep behavior of an Aluminum-2.0 wt% Lithium alloy was investigated in the temperature range from 300 to 500 deg C. This temperature interval corresponds to a solid solution of Li in Al. Experimental results indicate that Al-2.0wt%Li behaves as a pure metal class alloy (class II). This is demonstrated by several creep characteristics including the value of the stress exponent (n approx. 5), the shape of the creep curve, and the nature of the creep transient after a temperature change. However, anomalous behavior of the activation energy was observed. Activation energies up to 55 kilocalories per mole, decreasing to approximately 33 kcal/ mole at higher temperatures, were observed by the temperature cycling technique. (jg)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1989
- Accession Number
- ADA223676
Entities
People
- Earl F. Goodson
Organizations
- Naval Postgraduate School