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3.2 Aluminum alloys and steel Although fabrication trials for many different series of aluminum alloys , including Al-Cu , Al-Si and Al-Mg have been successfully carried out , the commercial value of WAAM is mainly justifiable for large and complex thin-walled structures , since cost of manufacturing small and simple aluminum alloy components using conventional machining processes is low .
 material: Aluminum alloys; material: steel; manufacturing process: fabrication; material: aluminum alloys; material: Al-Cu; material: Al-Si; material: Al-Mg; manufacturing process: WAAM; machanical property: complex thin-walled structures; concept or principle: cost of manufacturing; manufacturing process: simple; material: aluminum alloy; manufacturing process: conventional machining
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: Aluminum alloys; material: steel; manufacturing process: fabrication; material: aluminum alloys; material: Al-Cu; material: Al-Si; material: Al-Mg; manufacturing process: WAAM; machanical property: complex thin-walled structures; concept or principle: cost of manufacturing; manufacturing process: simple; material: aluminum alloy; manufacturing process: conventional machining