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The targeted experiment of Al and Al + Al2O3 deposited onto SLM Ti6Al4V via CS reveals that the hybrid additive manufacturing process can produce thick , dense and machinable FGMs composed of non-weldable metals without intermetallic phase formation at the multi-materials interface .
 concept or principle: experiment; material: Al; material: Al; material: Al2O3; manufacturing process: SLM; manufacturing process: additive manufacturing process; material: metals; material: intermetallic; concept or principle: interface
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:
 concept or principle: experiment; material: Al; material: Al; material: Al2O3; manufacturing process: SLM; manufacturing process: additive manufacturing process; material: metals; material: intermetallic; concept or principle: interface