Mechanical Responses and Dynamic Recrystallization Mechanism of A356 Alloy during Single and Double Isothermal Compression Processes
Mechanical Responses and Dynamic Recrystallization Mechanism of A356 Alloy during Single and Double Isothermal Compression Processes
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A356合金单、双等温压缩过程的力学响应及动态再结晶机制
DOI：
10.1007/s11665-022-07053-3
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发表时间：
2022-07
期刊：
影响因子：
--
通讯作者：
Ke Huang
中科院分区：
文献类型：
--
作者：
Zhenglong Liang;Liqun Niu;Hao Li;Qi Zhang;Ke Huang
研究了加载条件对A356铝合金单次和双次热压缩力学响应和动态再结晶的影响。结果表明，在第二次等温压缩过程中获得的应变硬化率远大于在初始等温压缩过程中获得的应变硬化率。单次和双次压缩后的组织均为变形柱状晶和等轴再结晶晶粒。双道次压缩后试样的再结晶分数受其初始位错密度和组织状态的影响很大。显微组织分析表明，亚晶界在原始晶界周围和变形柱状晶内部的演化是A356合金再结晶晶粒形成的主要机制。
The impacts of loading conditions on the mechanical response and DRX of A356 during single and double thermal compression were investigated. The results indicate that the strain hardening rate obtained during the second isothermal compression is far larger than that obtained during the initial isothermal compression. The microstructure after both single and double compression is dominated by deformed columnar grains and equiaxed recrystallized grains. The recrystallization fraction of the samples after double compression is greatly affected by its initial dislocation density and microstructure state. The microstructure examination shows that the evolution of the subgrain boundaries around the original grain boundaries and within the deformed columnar grains is the main mechanism for recrystallized grain formation in the A356 alloy.
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