Precipitation in Al–Mg solid solution prepared by solidification under high pressure

Precipitation in Al–Mg solid solution prepared by solidification under high pressure
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高压凝固制备的Al·Mg固溶体中的析出

DOI:
10.1016/j.matchar.2013.10.023
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发表时间:
2014
影响因子:
4.7
通讯作者:
T.J. Li
T.J. Li
中科院分区:
材料科学1区
文献类型:
--
作者:
H.W. Wang;C.M. Zou;Z.J. Wei;T.J. Li

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在含21.6at.%的Al-Mg固溶体中, 研究了在2GPa压力下凝固法制备镁合金。结果表明:时效过程中,固溶体中形成了γ-Al 12 Mg 17相,没有β′相存在。在加热过程中,γ相和β相的析出是不均匀的,即首先在枝晶间形成,这是由于高压凝固时Mg原子在固溶体中分布不均匀造成的。Al(Mg)固溶体的X射线衍射峰出现劈裂,当样品在423 K时效不同时间后,由于Al-Mg固溶体中析出的不均匀性,峰劈裂又消失。在423 K时效24 h后,观察到γ相直接转变为β相。认为β相是通过α + γ → β的包析反应形成的,该反应需要Mg原子在α/γ相界面扩散。
The precipitation in Al–Mg solid solution containing 21.6 at.% Mg prepared by solidification under 2 GPa was investigated. The results show that the γ-Al12Mg17phase is formed and the β′ phase cannot be observed in the solid solution during ageing process. The precipitation of γ and β phases takes place in a non-uniform manner during heating process, i.e. the γ and β phases are first formed in the interdendritic region, which is caused by the inhomogeneous distribution of Mg atoms in the solid solution solidified under high pressure. Peak splitting of X-ray diffraction patterns of Al(Mg) solid solution appears, and then disappears when the samples are aged at 423 K for different times, due to the non-uniform precipitation in Al–Mg solid solution. The direct transformation from the γ to β phase is observed after ageing at 423 K for 24 h. It is considered that the β phase is formed through a peritectoid reaction of α + γ → β which needs the diffusion of Mg atoms across the interface of α/γ phases.
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