Spectral standard sample of Al-Li alloy and its prepn

Abstract

The present invention is a spectral standard sample of Al-Li alloy and its preparation process. The present invention features the alloy contains the following chemical elements dispersed homogeneously in aluminum: Si 0.025-0.223 wt%, FE 0.044-0.264 wt%, Cu 0.0019-1.61 wt%, Mg 0.193-6.000 wt%, Li 0.930-2.530 wt%, Zr 0.042-0.168 wt%, Zn 0.023-0.205 wt%, Ti 0.0026-0.134 wt% and Mn 0.015-0.139 wt%. The present invention can avoid the burn loss and surface oxidation of Li element to ensure the correct ratio of Li element in the standard sample. The intermittent semi-continuous casting process prevents the cracking of the alloy ingot.

Description

(1) Technical field [0001] The invention relates to a standard sample for identifying aluminum materials, in particular to an Al-Li alloy spectral standard sample. (2) Technical background [0002] At present, Al-Li alloy is a new type of material. Its production and development must strictly control the required chemical composition, and to control the chemical composition of Al-Li alloy, there must be corresponding standard samples. The personnel draw the working curve according to the standard sample, and then determine the chemical composition of the produced or developed Al-Li alloy according to the working curve, as a standard for determining whether the product quality is qualified. The existing aluminum alloy standard samples do not contain Li element, and these standard samples are generally prepared through the processes of smelting, adjusting chemical composition, casting, homogenization treatment, extrusion and sawing. If you want to mix Li element in aluminum, ...

AI Technical Summary

Problems solved by technology

If you want to mix Li element in aluminum, it is impossible to use this preparation process. The reason is that Li element is easily burned during the smelting process, so that the Li element in the final standard sample cannot meet the design requirements. And in the crystallizer, the surface of the Al-Li liquid will be oxidized, seriously affecting the quality of the standard sample

The existing preparation method also has such shortcomings: what is used in the casting is the ordinary semi-continuous casting method, which is to directly flow the adjusted aluminum water into the crystallizer for casting without stopping in the middle until the casting is completed; the casting method Makes the ingot easy to crack and difficult to form