Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation
Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation
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DOI：
10.2320/matertrans.mb200912
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发表时间：
2010-01-01
影响因子：
1.2
通讯作者：
Pippan, Reinhard
中科院分区：
文献类型：
--
作者：
Bachmaier, Andrea;Hafok, Martin;Pippan, Reinhard
高压扭转（HPT）变形使块体材料的晶粒细化，直到达到饱和区域，在该区域不能观察到进一步的显微组织细化。通过使用纯铝、Al-1质量%的Mg合金和Al-3质量%的Mg合金来检查饱和区域上的合金化和应变速率。变形温度在-196 ° C和450 ° C之间变化。两种温度下的锌合金化对合金的饱和组织都有显著的影响.测量结果表明，在低温下结构演化的速率无关行为和在高温下结构演化的速率相关行为。提出了两种不同的过程来解释低温和高温下饱和的原因。[doi：10.2320/matertrans.MB200912]
High pressure torsion (HPT) deformation enables the grain refinement of bulk materials until a saturation region is reached where no further microstructural refinement can be observed, The influence of deformation temperature. alloying and strain rate on the saturation region was examined by using pure aluminum, an Al-l mass%Mg, alloy and an Al-3 mass%Mg alloy. The deformation temperature was varied between -196 degrees C and 450 degrees C. Both, temperature zinc alloying exhibit a pronounced influence on file saturation microstructure. The measurements reveal either a rate independent behavior of the Structural evolution at low temperatures and a rate dependent behavior of the Structural evolution at high temperatures. Two different processes are proposed to he the reason for the Saturation at low and hi-h homologous temperatures. [doi:10.2320/matertrans.MB200912]