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نبيل علاوي البهادلي ( مدرس )
كلية الهندسة - المواد
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IMPACT OF POWDER METALLURGY ON STRUCTURAL EVOLUTION IN PURE COPPER POWDER
تحميل
بحث النوع:
هندسة التخصص العام:
Nabeel Alawi Kadhim اسم الناشر:
Heider Yasser Thamir Amar J. Albaaji اسماء المساعدين:
International Journal of Mechanical Engineering and Technology (IJMET) Volume 9, Issue 10, October الجهة الناشرة:
International Journal of Mechanical Engineering and Technology (IJMET) Volume 9, Issue 10, October 2018, pp. 529–535, Article ID: IJMET_09_10_056 Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=9&IType=10 ISSN Print: 0976-6340 and ISSN Online: 0976-6359  
2018 سنة النشر:

الخلاصة

The effects of powder metallurgy variables on structural evolution in pure copper were studied here. Powders of pure copper were exposed to various periods (1, 3, and 5 hours) of high energy milling, in addition to non-milled case. Sintering in protected environment was accomplished. The consolidated parts then were characterized by XRD, EDS, and SEM to evaluate structural changes. Inspections revealed that a three dimensional treelike powder converted by milling to a rounded, flakey, granular, and other shapes of denser copper particles. Some agglomeration was noted. By increasing time of milling, agglomeration was increased too in first and mid stages, during last stage refinement was a dominant. EDS tests showed that both after milling and after sintering a high purity of products was recorded. Consolidated parts revealed a narrow grain size distribution for non-milled starting material, also, a wider size distribution for milled parts in addition to smaller grains sizes related to recrystallization, with some grain growth. By XRD, some extent of amorphous structure or loss in crystallinity was observed related to prolonged extensive plastic deformation, and it proportionated inversely to temperature of sintering. And this was in opposite to observations about grain growth and increased crystallinity in parts sintered in higher temperatures.