کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1581268 | 1514857 | 2009 | 7 صفحه PDF | دانلود رایگان |

The effect of compression ratio on the microstructure evolution of semi-solid ZK60 magnesium alloy produced by the recrystallisation and partial melting (RAP) process was investigated. The microstructure evolution within the semi-solid zone of a ZK60 alloy through a direct isothermal holding process from as-received and as-deformed conditions was also investigated. The results show that as-received alloys reheated to the semi-solid state had solid particles predominantly elongated along original extrusion direction. For as-deformed alloys, the compression deformation gradually refined the recrystallised α-Mg grains by increasing their nucleation to growth ratio. During isothermal holding, intragranular liquid droplets were present in a large number of solid particles, reducing in number and increasing in average size with increasing holding time. The coarsening behavior of solid particles in the semi-solid state obeyed an Ostwald ripening mechanism. The coarsening rate constant obtained was 556 μm3s−1 at 590 °C.
Journal: Materials Science and Engineering: A - Volume 501, Issues 1–2, 15 February 2009, Pages 146–152