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-phase),W-phase and Mg 7 Zn 3 phase in Mg 44 Zn 44 Gd 12 alloy were investigated.The results indicated that the I-phase in Mg 44 Zn 44 Gd 12 alloy was a face-centered icosahedral quasicrystal......
-phase),W-phase and Mg 7 Zn 3 phase in Mg 44 Zn 44 Gd 12 alloy were investigated.The results indicated that the I-phase in Mg 44 Zn 44 Gd 12 alloy was a face-centered icosahedral quasicrystal......
花瓣状逐渐向"十字架"状组织转变. 关键词: Al-Mg-Zn合金; Frank-Kasper相; 二十面体密堆结构; 组织形貌 中图分类号: TG244 文献标识码: A Frank-Kasper phase in Al-Mg-Zn icosahedral quasicrystal alloys ZHU Man, YANG Gen-cang, LIU Feng, CHENG Su..., with an icosahedral close-packed structure, Mg32(Al, Zn)49, is considered as the 1/1 approximant phase analogous to its icosahedral quasicrystal. The morphologies of Frank-Kasper phase in AlxMg40Zn60-x (x=20-45......
with thermal analysis.The results show that there is a liquid phase which could be in equilibrium with an a-Mg solid solution and an icosahedral quasicrystal I phase in the low-Y side of the Mg-Zn-Y system......
consists of either a petal-like icosahedral quasicrystal(IQC) phase(~20 μm) and block-shaped H1 phase(~15 μm) or IQC particles with an average grain size of ~107 nm as well as a small proportion of amorphous......
, Edagawa T, et al. New stable icosahedral quasicrystal in Mg-Pd-Al system[J]. Japan J Appl Phys, 1992, 31(9): 966-969. [6] LUO Zhi-ping, ZHANG Shao-qing, TANG Ya-li, et al. Quasicrystals in as-cast Mg...]. 北京: 国防工业出版社, 1998.DONG Chuang. Quasicrystal materials[M]. Beijing: National Defense Industry Press, 1998. [3] Koshikawa N, Yoda S, Edagawa K, et al. Formation of an icosahedral quasicrystal in the Mg......
] 董 闯. 准晶材料[M]. 北京: 国防工业出版社, 1998. DONG Chuang. Quasicrystalline materials[M]. Beijing: National Defence Industry Press, 1998. [10] TASI A P, INOUE A, MASUNOTO T. A stable quasicrystal in Al-Cu-Fe... alloys: A review[J]. Journal of Alloys and Compounds, 2004, 363: 150-174. [18] ZHANG Li-ming, R. Phase diagram of the Al-Cu-Fe quasicrystal-forming alloy system: V. Solidification behaviour of Al-Cu......
by suction-casting method were investigated primarily. Ti40Zr40Ni20 alloy, in which a nearly pure icosahedral quasicrystal (IQC) phase can form, has a low H-absorbing capacity of 0.8% (mass fraction... a promising future as new H-absorbing material. The results show that the alloy composition and preparation of Ti-Zr-Ni IQC have a significant effect on its H storage. Key words: Ti-Zr-Ni alloy; quasicrystal......
用下合金相图会发生改变[13-16].总之,随着压强增加,可明显观察到第二相的细化和均匀化,而第二相的体积分数则根据合金的不同而增加或减少.但是,相关的文献主要集中在Mg-Al系合金的研究,而对于新型高强度Mg-Zn-RE合金的压强作用效果的研究很少. 众所周知,作用于液体金属的有效压强会随着凝固壳层的增厚而逐渐降低[7, 17].从前述的文献可知,更高的外加压强可以更好地保持有效压强,从而对组织细化和均匀化有利,导致更好的力学性能.然而,考虑到过高的压强对模具有害,传统挤压铸造的最大挤压强小于200 MPa,一般在50~150 MPa之间.对挤压铸造中挤压强大于200 MPa的挤压铸件条件下合金熔液的凝固行为及组织特点等知之甚少. 近年来一些文献报道了含Mg的Al-Mg系铝合金在GPa级压强下的凝固行为[18-22].一些凝固特征,如液相线温度,异质形核及生长速度,与传统挤压铸造有着巨大......
phase particle (Mg3Zn6Er, icosahedral quasicrystal structure). The peak flow stress becomes larger with increasing strain rate and erbium addition at the same temperature, and gets smaller... (RE) were observed in these alloys after deformation. They are both Mg-Zn-RE ternary phase[11-15]. One of them is face-centered cubic (FCC) structure, another is icosahedral quasicrystal structure......
