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The evolution of these microstructural features explains the improved tensile ductility ( at its maximum > 23 % ) and reduced tensile strength for the heat treated SLMed aluminium alloy A357 samples .
 evolution, microstructural, tensile ductility, tensile strength, heat, SLMed, aluminium alloy, samples
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 evolution, microstructural, tensile ductility, tensile strength, heat, SLMed, aluminium alloy, samples