Ultrafine-grained Al–0.2Sc–0.1Zr alloy: The mechanistic contribution of nano-sized precipitates on grain refinement during the novel process of accumulative continuous extrusion
Ultrafine-grained Al–0.2Sc–0.1Zr alloy: The mechanistic contribution of nano-sized precipitates on grain refinement during the novel process of accumulative continuous extrusion
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超细晶Al-0.2Sc-0.1Zr合金：累积连续挤压新工艺中纳米析出物对晶粒细化的机制贡献
DOI：
10.1016/j.actamat.2015.08.043
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发表时间：
2015-11
期刊：
影响因子：
9.4
通讯作者：
R.D.K. Misra
中科院分区：
文献类型：
--
作者：
Y.F. Shen;R.G. Guan;Z.Y. Zhao;R.D.K. Misra
我们阐明了潜在的意义，纳米级，Al 3（Sc，Zr），沉淀物在获得超细晶组织的Al-0.2Sc-0.1Zr合金在新的过程中，被称为累积连续挤压成形（ACEF）。通过连续动态再结晶（CDRX），合金的晶粒尺寸从100 μm显著细化到800 nm。随着Al 3（Sc，Zr）析出相体积分数（Fv）与直径（d）之比的增加，纳米析出相对CDRX的影响显著。纳米尺寸的Al 3（Sc，Zr）析出物通过三种机制促进晶粒细化：（i）析出物通过促进位错和钉扎位错滑移的产生促进合金中高位错密度的保持，这增加了CDRX的驱动力，（ii）促进变形带的形成，为CDRX的激活提供位点，以及（iii）在晶界附近激活CDRX。
We elucidate the potential significance of nanosized, Al3(Sc, Zr), precipitates in obtaining ultrafine-grained structure in an Al–0.2Sc–0.1Zr alloy during the novel process, referred as accumulative continuous extrusion forming (ACEF). The grain size of the alloy was dramatically refined from 100 μm to 800 nm through continuous dynamic recrystallization (CDRX). The effectiveness of nanosized precipitates on CDRX was pronounced with increase in the ratio of the volume fraction (Fv) to the diameter (d) of the Al3(Sc, Zr) precipitates. Nanosized Al3(Sc, Zr), precipitates promoted grain refinement through three mechanisms: (i) the precipitates facilitated retention of high dislocation density in the alloy by promoting the generation of dislocation and pinning dislocation slip, which increased the driving force for CDRX, (ii) promoted the formation of deformation bands, providing sites for activation of CDRX, and (iii) activated CDRX near the grain boundary.
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