Pressure effect on crystallization temperature in Zr70Pd30 metallic glass
Pressure effect on crystallization temperature in Zr70Pd30 metallic glass
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DOI：
10.1063/1.1655684
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发表时间：
2004-04
影响因子：
3.2
通讯作者：
Jianzhong Jiang;S. Jeppesen;J. Saida;C. Lathe
中科院分区：
文献类型：
--
作者：
Jianzhong Jiang;S. Jeppesen;J. Saida;C. Lathe
通过使用同步辐射的原位 X 射线衍射测量，研究了压力对 Zr70Pd30 金属玻璃中非晶态到准晶态到金属间相变的影响。研究发现玻璃分两步结晶：(1)非晶到二十面体准晶和(2)二十面体准晶到金属间Zr2+xPd合金。该金属间合金具有四方结构，晶格参数为a=3.310(1)A和c=10.974(1)A，空间群为I4/mmm。外部压力以11±3 K/GPa和9±4 K/GPa的速率分别提高了准晶相和金属间化合物形成的起始温度，而准晶稳定的温度区间在0-3 GPa的压力范围内几乎保持不变。外部压力不影响选相顺序。用成核理论进一步讨论了准晶形成起始温度的提高。
The pressure effect on amorphous-to-quasicrystalline-to-intermetallic phase transformations in a Zr70Pd30 metallic glass has been investigated by in situ x-ray diffraction measurements using synchrotron radiation. It is found that the glass crystallizes in two steps: (1) amorphous-to-icosahedral quasicrystalline and (2) icosahedral quasicrystalline-to-intermetallic Zr2+xPd alloy. The intermetallic alloy has a tetragonal structure with lattice parameters, a=3.310(1) A and c=10.974(1) A, and a space group of I4/mmm. External pressure enhances the onset temperatures for the formation of quasicrystalline phase and intermetallic compound with rates of 11±3 and 9±4 K/GPa, respectively, while the temperature interval for the stability of quasicrystals remains almost unchanged in the pressure range of 0–3 GPa. External pressure does not affect the phase-selection sequence. The enhancement of the onset temperature for the formation of quasicrystals has been further discussed with the nucleation theory.