The influence of intermetallic phases in blocking crack growth

What is it about?

The mechanical and electrochemical properties of a new lightweight multicomponent Mg–10Li–9Al–6Zn–4Si alloy are presented, as well as damage growth under cavitation erosion conditions. The corrosion properties in synthetic seawater are typical of magnesium alloys. Short cracks in cavitation tests are formed as the tests begin. Despite additional exposures, their growth was effectively blocked by intermetallic phases. Oxidation of the alloy and/or interaction with corrosion processes contribute to the very rapid closure of the short cracks.

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Why is it important?

Due to the need to reduce greenhouse gas (GHG) emissions, new lightweight materials are needed for transportation applications. Nowadays, aluminum alloys and composites are the most popular in this important class of materials. Magnesium has a 33% lower density than aluminum and therefore offers potential for additional weight reduction. This work shows the results of a study of damage development, particularly crack growth in a newly developed lightweight magnesium-based multi-component alloy.