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FCC-NiZr2相(a=b=c=1.12 nm),FCC-NiZr2相单胞中存在96个原子,结构分析表明该单胞内含有以Ni为心的Ni4Zr9二十面体团簇.在立方结构的AlNiZr(Cu2Mg)和六角结构的Al2Zr(MgZn2)Laves相中都存在二十面体团簇. 从对称性上讲,二十面体与前几个团簇不同,其第一近邻常均匀地位于同一壳层.在合金相中还存在大量配位数多于12的多面体,但是其壳层结构往往可以按照......
B Y, PENG L M, DING W J. First-principles investigation of the binary AB2 type Laves phase in Mg-Al-Ca alloy: Electronic structure and elastic properties[J]. Solid State Science, 2009, 11(8......
] DONG Li-xin, WANG Hua-ming. Microstructure and mechanical properties of laser melting deposited Ti2Ni3Si/NiTi Laves alloy [J]. Transactions of Nonferrous Metals Society of China, 2007, 17(6......
, Mg2Ca and MgZn2 Laves phase by first principles calculations [J]. Transactions of Nonferrous Metals Society of China, 2014, 24: 2920-2929. [31] PENG Hua, WANG Chun-lei, LI Ji-chao, ZHANG Rui-zhi WANG......
. The behaviors of CaO in magnesium melt have been widely investigated, and some Ca-containing particles in magnesium alloys have also be found and characterized, such as Mg2Ca, CaMgSi, and Laves C15 phase......
confirmed through TEM examination at the grain boundaries [13]. The MgZnCu intermetallic compound was a Laves phase of the C15 MgCu2 type which had high melting point and good thermal stability [19]. Fig. 3......
of Alloys and Compounds, 2016, 658: 483-487. [17] Liu Yong, Yuan Guang-yin, Ding Wen-jiang, Lu Cheng. Deformation behavior of Mg-Zn-Gd-based alloys reinforced with quasicrystal and Laves phases at elevated......
type Laves phase in Mg-Al-Ca alloy: Electronic structure and elastic properties[J]. Solid State Science, 2009, 11(8): 1400-1407. Microstructure and mechanical properties of laser welding joint......
解,导致腐蚀初期与SLM态相似.由于腐蚀是在 650 ℃条件下进行,样品依然会发生在熔池边界的溶解和 Laves 元素均匀化的扩散,在经历 25 h 的扩散与溶解之后,熔池边界消失,元素得以均匀分布.由于S和O元素提供快速的通道关闭,抗腐蚀元素得到均匀分布,材料的抗腐蚀性能得到大幅度的提升,表现出类似标准热处理和均匀化样品的性质.经过高温热处理之后,材料的熔池边界完全消失,溶质得到了均匀分散,样品......
相,富Nd相外,非常容易出现Ce2Fe17相,还存在较多的CeFe2等富Fe相,磁体的最优成分与烧结Nd-Fe-B磁体不同,而烧结Nd-Fe-B磁体中并无类似的相.Fe含量越高越倾向于形成熔点较高的CeFe2,Ce2Fe17.以前的研究认为[24-25],独立存在的CeFe2 Lave相实际上降低了富Nd相的浸润性,使得填充到晶间的起退磁耦合的富Nd相减少.CeFe2 Laves相的存在妨碍了高......