Superplastic Behavior of Reciprocating Extruded Mg-6Zn-1Y-0.6Ce-0.6Zr from Rapidly Solidified Ribbons  

作　　者：郭学锋 YANG Wenpeng REN Fang 

机构地区：[1]School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China [2]School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 71004&China [3]School of Economics and Management,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第6期1033-1037,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No. 50271054);the Doctoral Programs Foundation of Ministry of Education of China (No. 20070700003);the Science and Technologies Foundation of Henan of China (No. 102102210031);the Natural Science Foundation of Henan Educational Committee of China(2010A430008)

摘　　要：RRE-Mg66 alloy with a composition of Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6Zr was prepared by combinatorial processes of rapid solidification, reciprocating extrusion and extrusion. Microstructure was evaluated on SEM and TEM. The average grain size of the alloy is 0.7 μm, the size of the second phase at grain boundary is 0.15 μm, and the size of the intragranular precipitates in round shape is less than 20 nm, Superplastic behavior of the material was investigated in a temperature range of 150 to 250 ℃ and initial strain rate range of 3.3×10^-4 to 3.3 × 10^-2 s^-1 in air. The highest elongation of 270% was obtained at 250 ℃ and 3.3 × 10^-3 s-L High-strain-rate superplasticity and low-temperature superplasticity were achieved. The superplasticity results from intragranular sliding （IGS） at temperatures from 170 to 〈 200 ℃ and grain boundaries sliding （GBS） at 250 ℃. At 200 ℃ a combination of IGS and GBS contributes to the superplastic flow.RRE-Mg66 alloy with a composition of Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6Zr was prepared by combinatorial processes of rapid solidification, reciprocating extrusion and extrusion. Microstructure was evaluated on SEM and TEM. The average grain size of the alloy is 0.7 μm, the size of the second phase at grain boundary is 0.15 μm, and the size of the intragranular precipitates in round shape is less than 20 nm, Superplastic behavior of the material was investigated in a temperature range of 150 to 250 ℃ and initial strain rate range of 3.3×10^-4 to 3.3 × 10^-2 s^-1 in air. The highest elongation of 270% was obtained at 250 ℃ and 3.3 × 10^-3 s-L High-strain-rate superplasticity and low-temperature superplasticity were achieved. The superplasticity results from intragranular sliding （IGS） at temperatures from 170 to 〈 200 ℃ and grain boundaries sliding （GBS） at 250 ℃. At 200 ℃ a combination of IGS and GBS contributes to the superplastic flow.

关 键 词：rapid solidification reciprocating extrusion EXTRUSION SUPERPLASTICITY 

分 类 号：TG379[金属学及工艺—金属压力加工]