P. N. Comley, The Boeing Company, Seattle, WA
Abstract
The determination of the superplastic properties of a material, just like any mechanical property, is highly dependent on the test method, coupon geometry and analysis of the raw data from the test. Thus the published properties of a material from one source will differ from that of another source unless a common test method is employed. The ASTM E2448 Standard Test Method for Determining the Superplastic Properties of Metallic Sheet Materials has been written to provide a common platform for testing, evaluating and publishing superplastic properties to a uniform format, useful for both academia and industry. The Boeing Company is now using ASTM 2448 to quantify the superplastic properties of fine grain Ti-6Al-4V alloy, and is specifying it to qualify production material to the Boeing Material Standard BMS7-385.
The standard includes specimen geometry and testing conditions, the test machine requirements, and how to analyze the data, including the basic stress v. strain curve and determination of ‘m’ value.
Summary: Summary to come.
