Effect of cooling rate on microstructure and mechanical properties of rapidly solidified Al-based bulk alloys

Effect of cooling rate on microstructure and mechanical properties of rapidly solidified Al-based bulk alloys
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冷却速率对快凝铝基合金显微组织和力学性能的影响

DOI:
10.1016/j.jallcom.2010.03.211
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发表时间:
2010-08
影响因子:
6.2
通讯作者:
Zhang, Tao
Zhang, Tao
中科院分区:
材料科学2区
文献类型:
--
作者:
Pang, Shujie;Wang, Hui;Zhuo, Longchao;Zhang, Tao

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研究了铜模铸造Al86Si0.5Ni4.06Co2.94Y6Sc0.5合金在不同冷却速度下的组织和力学性能。随着凝固过程中冷却速率的降低,这些快速凝固合金的微观结构从直径为1 mm的棒的几乎完全非晶变化到直径为1.5 mm和2 mm的冷却区表面层状结构。与在较快冷却速率下形成的直径为1 mm的合金棒相比,直径为1.5 mm和2 mm的合金具有较低的强度,但由于形成了具有软内核和硬冷却区外壳的复合结构,具有较大的压缩塑性。结果表明,采用适当的冷却速度可以调控快速凝固铝基块体合金的力学性能。
The microstructure and mechanical properties of Al86Si0.5Ni4.06Co2.94Y6Sc0.5alloys produced by copper mold casting at different cooling rates were investigated. With decreasing the cooling rate during solidification, the microstructure for these rapidly solidified alloys varied from almost fully amorphous for 1-mm-diameter rod to chill-zone surface layered structures for 1.5-mm- and 2-mm-diameter ones. Compared to the 1-mm-diameter alloy rod formed at a faster cooling rate, the 1.5-mm- and 2-mm-diameter alloys possess lower strength, whereas larger compressive plasticity due to the formation of composite structure with soft inner core and hard chill-zone outer shell. The results indicate that the mechanical properties of the rapidly solidified Al-based bulk alloys can be tunable by employing proper cooling rate.
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