メカニカルアロイング法によるFe-Cr合金の合成とその固化成形 Synthesis of Fe-Cr Alloys by Mechanical Alloying and its Consolidation
Fe<SUB>32</SUB>Cr<SUB>68</SUB>, Fe<SUB>42</SUB>Cr<SUB>58</SUB>, Fe<SUB>52</SUB>Cr<SUB>48</SUB>, Fe<SUB>62</SUB>Cr<SUB>38</SUB> and Fe<SUB>72</SUB>Cr<SUB>28</SUB> were synthesized by mechanical alloying (MA) of Fe powder and Cr powder using a planetary ball milling for 180ks in 1.33kPa argon gas atmosphere. In particular, the influence of milling time on structural phase of Fe<SUB>52</SUB>Cr<SUB>48</SUB> has been studied. Because according to the phase diagram, a phase is expected to form on the composition of Fe<SUB>52</SUB>Cr<SUB>48</SUB>. As the Cr content of MA powder increased, the time for homogenization by MA became longer.<BR>These MA powders were compacted by Spark Plasma Sintering (SPS) process. Mechanical alloyed Fe<SUB>52</SUB>Cr<SUB>48</SUB> was rapidly shrunk at above 800K and completely condensed above 1073K. Fe<SUB>52</SUB>Cr<SUB>48</SUB> which compacted by SPS at 1073K had no pore and its density was 7.46g/cm<SUB>3</SUB>.<BR>Fe-Cr alloy prepared by this process contained no σ-phase.
粉体および粉末冶金 44(6), 560-564, 1997-06-15
Japan Society of Powder and Powder Metallurgy