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應變速率對AZ61鎂合金動態(tài)再結晶行為的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時間：2015-12-08
采用光學顯微鏡、SEM/EBSD和組織定量分析技術研究AZ61鎂合金在623 K、3×10?5~3×10?1 s?1下單向壓縮時變形和動態(tài)再結晶行為。
應變速率對AZ61鎂合金動態(tài)再結晶行為的影響Influence of strain rate on dynamic recrystallization behavior of?AZ61 magnesium alloy
采用光學顯微鏡、SEM/EBSD和組織定量分析技術研究AZ61鎂合金在623 K、3×10?5~3×10?1?s?1下單向壓縮時變形和動態(tài)再結晶行為。結果表明：AZ61鎂合金的流變應力和動態(tài)再結晶行為強烈地受到應變速率的影響；隨著應變速率的提高，穩(wěn)態(tài)流變應力對應變速率的敏感性逐漸減弱，而峰值應力對應變速率的敏感性卻呈先減弱后又顯著增強的趨勢。提高應變速率可加快動態(tài)再結晶進程，但高速變形初期產生更多的粗大 孿晶，不利于完全再結晶而導致穩(wěn)態(tài)時的再結晶體積分數反而較低；在中低應變速率下動態(tài)再結晶以晶界弓出形核為主，而在高應變速率下則主要通過孿晶分割來進行；由應變速率引起變形機制的變化是導致不同動態(tài)再結晶行為的原因。
The deformation and dynamic recrystallization behavior of magnesium alloy AZ61 were studied at 623 K and 3×10?5?3×10?1?s?1?by optical and SEM/EBSD metallographic observation. The results show that the flow stresses and the dynamic recrystallization behavior are dependent on strain rates. With the increase of the strain rate, the strain rate sensitivity becomes weaker for steady state stresses while the strain rate sensitivity for the peak stress decreases firstly then increases obviously. Increasing strain rate can accelerate the process of dynamic recrystallization and the development of coarse ?twins which are harmful to get a complete recrystallization structure leading to the decrease of fractional recrystallization. Bulging mechanism for dynamic recrystallization nucleation operates mainly at lower strain rate, whereas the dynamic recrystallization substructure developed at higher strain rate is characterized by twin intersections. The difference of deformation mode leads to the operation of different mechanisms of dynamic recrystallization nucleation.
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