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Elemental Mg loss during the WAAM of Al–Mg alloy was investigated and the effect of Mg loss on the mechanical properties was discussed based on results from the chemical composition measurement and mechanical properties test .
 material: Mg; manufacturing process: WAAM; material: alloy; material: Mg; concept or principle: mechanical properties; concept or principle: chemical composition; concept or principle: mechanical properties
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 material: Mg; manufacturing process: WAAM; material: alloy; material: Mg; concept or principle: mechanical properties; concept or principle: chemical composition; concept or principle: mechanical properties