Effects of Static Magnetic Field on Compression Properties of Mg-Al-Gd Alloys Containing Gd-Rich Ferromagnetic Phase.
Effects of Static Magnetic Field on Compression Properties of Mg-Al-Gd Alloys Containing Gd-Rich Ferromagnetic Phase.
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静磁场对富Gd铁磁相Mg-Al-Gd合金压缩性能的影响
DOI：
10.3390/ma13214957
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发表时间：
2020-11-04
期刊：
影响因子：
--
通讯作者：
Feng X
中科院分区：
文献类型：
--
作者：
Cai Q;Li X;Li S;He C;Liu X;Feng X
Mg-0.6Al-20.8Gd （wt.%）合金在620℃、0 T和1 T下均匀化20 min，然后分别进行炉冷、淬火和空冷。研究了磁场对Mg-Al-Gd合金相组成、显微组织、二次相析出及力学性能的影响。Mg-Al-Gd合金中含有α-Mg、Mg5Gd、Al2Gd和GdH2相，其相成分受外加磁场影响较小。磁场加速了顺磁性Mg5Gd的析出，抑制了铁磁性Al2Gd的析出。在磁场作用下，α-Mg的Al2Gd相在晶界处发生了明显的细化和偏析，从而导致α-Mg晶粒由枝晶变为玫瑰花状。当磁场只作用于均匀化阶段时，淬火合金中Mg5Gd相的含量基本保持不变，而Mg5Gd板条则明显细化。Al2Gd和GdH2相含量增加，但析出部位仍在α-Mg晶粒内。Mg5Gd颗粒不能提供析出强化，而Al2Gd和GdH2颗粒对力学性能有积极的增强作用。在淬火条件下，磁处理可以提高硬度、抗压强度和延展性，而在炉内冷却条件下，磁处理可以抑制这些力学性能。
The Mg–0.6Al–20.8Gd (wt.%) alloys were homogenized at 620 °C for 20 min under 0 T and 1 T, followed by furnace cooling, quenching, and air cooling, respectively. The effects of the magnetic field on the phase constituent, microstructure, secondary phase precipitation, and mechanical properties of the Mg–Al–Gd alloys were investigated. The Mg–Al–Gd alloys contained α-Mg, Mg5Gd, Al2Gd, and GdH2 phases, and the phase constituents were hardly influenced by the applied magnetic field. However, the precipitation of the paramagnetic Mg5Gd upon cooling was accelerated by the magnetic field, and that of the ferromagnetic Al2Gd phases was inhibited. In addition, the Al2Gd phase was significantly refined and driven to segregate at the grain boundaries by the magnetic field, and the resultant pinning effect led to the microstructure change from dendritic α-Mg grains to rosette-like ones. When the magnetic field was only applied to the homogenization stage, the content of the Mg5Gd phase remained unchanged in the quenched alloy, whereas the Mg5Gd laths were significantly refined. By contrast, the contents of the Al2Gd and GdH2 phases were increased, while the precipitation sites were still within the α-Mg grains. The Mg5Gd laths were incapable of providing precipitation strengthening, while the Al2Gd and GdH2 particles brought positive effects on the enhancement of the mechanical properties. In the quenching condition, the hardness, compression strength, and ductility can be improved by the magnetic treatment, whereas these mechanical properties can be suppressed in the furnace cooled condition by the magnetic treatment.
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影响因子：
9.4
作者：
Li, Xi;Fautrelle, Yves;Ren, Zhongming
通讯作者：
Ren, Zhongming
DOI：
10.1016/s1468-6996(00)00016-4
发表时间：
2000-01-01
影响因子：
5.5
作者：
Asai, S.
通讯作者：
Asai, S.
影响因子：
6.2
作者：
Hanna, Abdelkader;Azzeddine, Hiba;Langdon, Terence G.
通讯作者：
Langdon, Terence G.
DOI：
10.1016/0956-7151(93)90356-w
发表时间：
1993-01-01
期刊：
ACTA METALLURGICA ET MATERIALIA
影响因子：
--
作者：
LIN, M;OLSON, GB;COHEN, M
通讯作者：
COHEN, M
影响因子：
4.7
作者：
Rzychon, Tomasz;Kielbus, Andrzej;Litynska-Dobrzynska, Lidia
通讯作者：
Litynska-Dobrzynska, Lidia