The effect of the addition of ta on the structure, crystallization and mechanical properties of Zr-Cu-Ni-Al-Ta bulk metallic glasses
The effect of the addition of ta on the structure, crystallization and mechanical properties of Zr-Cu-Ni-Al-Ta bulk metallic glasses
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DOI：
10.1016/j.msea.2006.10.004
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发表时间：
2007-02
期刊：
影响因子：
6.4
通讯作者：
L. Liu;K. Chan;M. Sun;Qiankun Chen
中科院分区：
文献类型：
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作者：
L. Liu;K. Chan;M. Sun;Qiankun Chen
采用铜模铸造法在Zr 65 − xTaxCu 17.5Al 7.5Ni 10（x=1-10at%）合金系统中制备了Zr基大块金属玻璃（BMG）或大块金属玻璃基复合材料（BMG C），并改变了Ta的含量。当Ta含量小于2at%时，BMG形成了整体非晶相;当Ta含量大于5at%时，形成了Ta固溶体增强的非晶基复合材料。Ta的加入也显著影响了非晶相的晶化。Ta含量为2-5at%时，合金发生多步晶化过程，优先形成准晶; Ta含量超过此范围时，合金发生单步晶化过程，形成稳定的Zr-Cu金属间化合物。准静态压缩试验表明，随着Ta含量的增加，基体BMG的断裂强度和塑性均显著提高。讨论了Ta对Zr基合金的结构、晶化过程和变形行为的影响。
Zr-based bulk metallic glasses (BMGs) or bulk metallic glass matrix composites (BMGCs) have been prepared by using a copper-mold casting in the Zr65−xTaxCu17.5Al7.5Ni10(where x=1–10at%) alloy system while varying the Ta content. A monolithic amorphous phase of BMG was achieved when Ta was less than 2at%, while amorphous matrix composites reinforced by Ta-solid solutions were obtained when Ta is 5at% or higher. The addition of Ta also affected significantly the crystallization of the amorphous phase. A multi-step process of crystallization with a preferential formation of quasicrystals occurred in the alloys containing 2–5at% Ta, while a single-step pathway of crystallization with the formation of stable Zr–Cu intermetallic compounds took place when Ta was beyond this range. In addition, a quasi-static compression test revealed that both fracture strength and plasticity of the base BMG were remarkably enhanced as Ta content increased. The effect of the addition of Ta on the structure; crystallization process; and deformation behavior of the Zr-based alloys is discussed.