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Results show that dissolved oxygen in the weld zone has a strong influence on increasing the number of α phase nucleation sites that can lead to different αp morphologies in the base metal and weld zone .
 material: oxygen; concept or principle: weld zone; concept or principle: phase nucleation sites; material: lead; concept or principle: morphologies; material: base metal; concept or principle: weld zone
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: oxygen; concept or principle: weld zone; concept or principle: phase nucleation sites; material: lead; concept or principle: morphologies; material: base metal; concept or principle: weld zone