Ferrous and Nonferrous Bulk Amorphous Alloys
Ferrous and Nonferrous Bulk Amorphous Alloys
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DOI：
10.4028/www.scientific.net/msf.269-272.855
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发表时间：
1998-01
期刊：
影响因子：
--
通讯作者：
A. Inoue;T. Zhang;A. Takeuchi
中科院分区：
文献类型：
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作者：
A. Inoue;T. Zhang;A. Takeuchi
已经发现，在许多多组分系统中可以制备厚度达75 mm、晶化前过冷液相区达127 K的大块非晶合金，这些系统满足获得大的玻璃形成能力的三个经验规则，即，(1)由三种以上组成元素组成的多组分合金系统，（2）主要组成元素之间原子尺寸比显著不同，大于12%，和（3）它们的元素之间的负混合热。这三条经验规则的科学意义已根据大量的实验数据以及晶相成核和生长的动力学理论得到了证明。通过选择合适的成分，满足三个经验规则，大块非晶合金在Mg-，镧系金属-，Zr-，Pd-，Fe-和Co-为基础的系统被生产在圆柱形和片状形式通过各种凝固过程。Zr基块体非晶合金具有高的抗拉强度、良好的塑性、高的弹性能、高的冲击断裂能和高的耐腐蚀性能，Fe基块体非晶合金具有良好的软磁性能。此外，它们的大块非晶合金在过冷液相区加热后，可以通过粘性流动变形成各种形状。在过冷液体中实现了理想的牛顿流动。理想的超塑性的利用使得能够实现超过15000%的极大延伸率。这些优异的数据使我们可以预期，具有高达75 mm的宽厚度范围的大块非晶合金将发展成为一种新型的工程材料。
Bulk amorphous alloys with thicknesses up to 75 mm and a wide supercooled liquid region reaching 127 K before crystallization have been found to be fabricated in a number of multicomponent systems which satisfy the three empirical rules for the achievement of large glass-forming ability, i.e., (1) multicomponent alloy systems consisting of more than three constituent elements, (2) significantly different atomic size ratios above 12 % among the main constituent elements, and (3) negative heats of mixing among their elements. The scientific significance of the three empirical rules has been proved based on a number of experimental data as well as on the kinetic theories of the nucleation and growth of a crystalline phase. By choosing appropriate compositions which satisfy the three empirical rules, bulk amorphous alloys in Mg-, lanthanide metal-, Zr-, Pd-, Fe- and Co-based systems were produced in cylindrical and sheet forms by various solidification processes. The bulk amorphous alloys exhibit high tensile strength, good ductility, high elastic energy, high impact fracture energy and high corrosion resistance for Zr-based system and good soft magnetic properties for Fe-based system. Furthermore, their bulk amorphous alloys heated in the supercooled liquid region can be deformed into various shapes by viscous flow. The ideal Newtonian flow has been achieved in the supercooled liquid. The utilization of the ideal superplasticity enabled the achievement of an extremely large elongation exceeding 15000 %. These excellent data allow us to expect that the bulk amorphous alloys with a wide thickness range up to 75 mm develop as a new type of engineering material.