Assessment of a Historical Aluminium alloy : A study on Fritzi metal along with an analysis on the properties and casting trials
Abstract: During World War I, Otto Meyer invented the alloy Fritzi metal, and the composition died with him. However, there are descriptions of the alloy's properties. Previously, an attempt to identify the composition was made, resulting in simulated properties that did not match those described. In this project, Thermo-Calc simulations concerning solidus and liquidus temperatures were conducted, and combined with previous research on the Al-Zn-Cu system. These suggested that the composition 75Al20Zn5Cu wt% (weight percent) would be a closer match for the description, especially if considering that the stated melting temperature may have been the pouring temperature. In addition, density tests and calculations found the alloy significantly lighter than described. However, the description was possibly not literal. With a selected composition, casting trials, hardness and weldability tests followed. The alloy was found easy to cast with and sufficiently hard for its application. Welding the material proved to be possible if the correct method, pulsed direct current, was used. In the end, the proposed alloy was similar to the description, and potential explanations were made for the remaining differences.
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