Mechanical properties of iron-based bulk metallic glasses
Mechanical properties of iron-based bulk metallic glasses
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DOI：
10.1557/jmr.2007.0036
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发表时间：
2007-02-01
影响因子：
2.7
通讯作者：
Shiflet, Gary J.
中科院分区：
文献类型：
--
作者：
Gu, X. J.;Poon, S. Joseph;Shiflet, Gary J.
铁基大块金属玻璃(BMG)具有高断裂强度和高弹性模数的特点，有的断裂强度接近4 GPA，是传统高强度钢的2-3倍。在铁基BMG中，非铁磁性的BMG被两位作者命名为“非铁磁性非晶钢合金”[S.J.Poon等人：APPL.太棒了。让我们来吧。83,1131(2003)]，具有足够高的玻璃形成能力，足以形成直径达16 mm的单相玻璃棒。设计用于结构应用的铁基BMG必须在压缩下表现出一定的塑性。然而，合金成分对金属玻璃的塑性和脆性破坏的作用在很大程度上是未知的。根据最近观察到的BMG塑性与泊松比之间的关系，研究了成分对非晶钢塑性和弹性性能的影响。对于新的非晶钢，断裂强度高达4.4 GPA，塑性应变高达0.8%。当泊松比从下到下接近0.32时，出现了塑性破坏而不是脆性破坏。研究了合金弹性模数与合金元素弹性模数之间的关系，发现在设计延性铁基BMG时，除了合金元素的弹性模数外，还必须考虑原子间的相互作用。讨论了铁基BMG获得高断裂韧性的前景。
Iron-based bulk metallic glasses (BMGs) are characterized by high fracture strengths and elastic moduli, with some exhibiting fracture strengths near 4 GPa, 2-3 times those of conventional high-strength steels. Among the Fe-based BMGs, the non-ferromagnetic ones, designated "non-ferromagnetic amorphous steel alloys" by two of the present authors [S.J. Poon et al.: Appl. Phys. Lett. 83, 1131 (2003)], have glass-forming ability high enough to form single-phase glassy rods with diameters reaching 16 mm. Fe-based BMGs designed for structural applications must exhibit some plasticity under compression. However, the role of alloy composition on plastic and brittle failures in metallic glasses is largely unknown. In view of a recently observed correlation that exists between plasticity and Poisson's ratio for BMGs, compositional effects on plasticity and elastic properties in amorphous steels were investigated. For the new amorphous steels, fracture strengths as high as 4.4 GPa and plastic strains reaching similar to 0.8% were measured. Plastic failure instead of brittle failure was observed as the Poisson's ratio approached 0.32 from below. Investigation of the relationship between the elastic moduli of the alloys and those of the alloying elements revealed that interatomic interactions in addition to the elastic moduli of the alloying elements must be considered in designing ductile Fe-based BMGs. The prospects for attaining high fracture toughness in Fe-based BMGs are discussed in this article.