en گروه استخراج Metallurgical Extraction and Processing Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:normal"><span style="tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span calibri="" style="font-family:"><span lang="EN" new="" roman="" style="font-family:" times="">This study utilized aluminum, copper powder according to the stoichiometric ratio of Al₂Cu, and calcium powder in relation to the eutectic composition of Al-Ca at the ratio of 5.5 atomic percent. Two samples were prepared, one without calcium and another with calcium, and were analyzed to determine the impact of calcium on the formation of copper aluminide. Samples were subjected to thermal treatment at temperature of 400, 600, and 800&ordm;C. The obtained results indicated that disappearance of Al₂Cu phase at 800&ordm;C in calcium-free sample and existence of Al₂Cu phase in calcium sample indicating a possible role of calcium in stabilization of Al₂Cu phase. Furthermore, it was concluded that calcium influences phase formation. There was higher diffusion of aluminum in to copper resulting in formation of Al₄Cu₉ not only in the sample with calcium, but also in calcium-free sample. One more finding of the research is that calcium influences microstructure and its homogenization as well. In particular</span><span new="" roman="" style="font-family:" times="">,</span><span lang="EN" new="" roman="" style="font-family:" times=""> it was found that calcium-containing sample has the least number of pores and was uniform in the structure.</span><span new="" roman="" style="font-family:" times=""><span style="color:red"></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="line-height:107%"><span calibri="" style="font-family:"><span dir="LTR" style="font-family:"Times New Roman",serif"></span></span></span></span></span></span> Copper,Aluminum,Calcium,Elemental powders,Microstructure 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-4763-4&slc_lang=en&sid=1 Razieh Khoshhal rkhoshhal@birjandut.ac.ir 1800319475328460022848 1800319475328460022848 Yes Associate professor, Birjand University of Technology, Department of Materials and Metallurgical Engineering Seyed Vahid Alavi Nezhad Khalil Abad svalavi@birjandut.ac.ir 1800319475328460022849 1800319475328460022849 No Birjand University of Technology, Department of Civil Engineering, P.O. Box 97175/569, Birjand