Synthesis of non-equilibrium phases in immiscible metals mechanically mixed by high pressure torsion
- 181 Downloads
The structural changes in mechanically mixed metals of immiscible combinations of elements caused by bulk mechanical alloying (MA) through the use of high pressure torsion (HPT) were investigated in Ag–Ni and Nb–Zr systems. There was no alloying between Ag and Ni on atomic scale even after 100 rotations of HPT. On the other hand, the β-Zr phase started to appear after HPT 2 rotations in the Nb–Zr system, even though β-Zr is a high temperature phase. Further, Nb and Zr were completely mixed to form a bcc structured single phase after HPT 100 rotations. The sequence of alloying in the Nb–Zr system during HPT was discussed. These results clearly suggest that non-equilibrium phases can form in the Nb–Zr system by bulk MA by the use of HPT.
KeywordsMechanical Alloy Select Area Electron Diffraction Accumulative Roll Bonding High Pressure Torsion Supersaturated Solid Solution
This study was financially supported by the Grant-in-Aid for Exploratory Research (contract No. 21656188) as well as that for Innovative Area, “Bulk Nanostructured Metals” (contract No. 2201) through MEXT, Japan.
- 3.Liu ZG, Guo JT, Hu ZQ (1995) Mater Sci Eng A 192(193):577Google Scholar
- 4.Jiang JZ, Gente C, Bormann R (1998) Mater Sci Eng A242:268Google Scholar
- 12.de Boer FR, Boom R, Mattens WCM, Miedema AR, Niessen AK (1989) Cohesion in metals transition metal alloys. North-Holland Physics Publishing, AmsterdamGoogle Scholar
- 13.Singleton M, Nash P (1991). In: Nash P (ed) Phase diagrams of binary nickel alloys. ASM international, Materials Park, OH, pp 1–3Google Scholar
- 15.German VN, Bakanova AA, Tarasova LA, Sumulov YuN (1970) Sov Phys Solid State 12:490Google Scholar
- 19.Zhilyaev AP, Gálvez F, Sharafutdinov A, Pérez-Prado MT (2010) Mater Sci Eng A527:3918Google Scholar