摘要
Z91合金的压缩行为研究表明 ,在室温和 350℃下 ,选取应变速率在 5 .6× 1 0 - 3～ 1 .8× 1 0 - 2 s- 1 之间变化时 ,真应力 -真应变曲线变化规律呈现一致性 ,真应力值差距不明显 ,压缩屈服强度σ0 .2 比较接近 ;在 2 50℃下 ,真应力值因应变速率的不同差距比较明显 ,随着应变的增加 ,真应力趋向稳定值。压缩后的试样形貌从室温到 350℃之间的变化规律为 :剪切破碎 -部分饼状 -完全饼状。观察变形组织发现 ,变形后的AZ91合金中出现了大量的动态再结晶晶粒。
The compressive behavior of AZ91 alloy investigated show that the true stress curve depicts the same regulation at the strain rate of 5.6×10 -3～1.8×10 -2 s -1 at room temperature and 350 ℃. Under this condition, the yield strength σ_ 0.2 keeps the same scale. However, the true stress-true strain curve appears different due to varied strain rates, and the true stress increases with the increasing strain rate and finally stays to be certain one like ordinary materials. The macrograph of deformed specimens shows from shearing break-up, partial pancake to complete pancake. A great many recrystallized grains were formed in the deformed samples of AZ91 alloy.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第6期1015-1018,共4页
Chinese Journal of Rare Metals
基金
中国博士后科学基金资助项目 (2 0 0 30 330 90 )
