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1INTRODUCTIONUltrafinepowderswithaparticlesizelesthan100nmhaveexcelentpropertiesincontrasttocoarsegrainmaterials[1,2]andhavew...
1INTRODUCTIONUltrafinepowderswithaparticlesizelesthan100nmhaveexlentpropertiesincontrasttocoarsegrainmaterials [1,2] andhavew ...