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Chemistry (intrinsic) and inclusion (extrinsic) effects on the toughness and Weibull modulus of Fe-based bulk metallic glasses

机译:化学(本征)和夹杂物(本征)对铁基大块金属玻璃的韧性和威布尔模量的影响

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Systematic changes in composition were employed to increase the notch toughness of a variety of Fe-based Bulk Metallic Glasses (BMGs). The Fe_(50)Mn_(10)Mo_(14)Cr_4C_(16)B_6 BMG possessed very high hardness (e.g. 12GPa) but very low notch toughness (e.g. 5.7MPam'') at room temperature, consistent with fracture surface observations of brittle features. Many of the other Fe-BMG variants, created to change the Poisson's ratio via systematic changes in alloy chemistry, exhibited higher toughness but more scatter in the data, reflected in a lower Weibull modulus. SEM examination revealed fracture initiation always occurred at inclusions in samples exhibiting lower toughness and/or Weibull modulus for a given chemistry. Implications of these observations on reliability of BMGs are discussed.
机译:系统地改变了成分,以提高各种铁基块状金属玻璃(BMG)的缺口韧性。 Fe_(50)Mn_(10)Mo_(14)Cr_4C_(16)B_6 BMG在室温下具有非常高的硬度(例如12GPa),但是缺口韧性非常低(例如5.7MPam''),与断裂表面的脆性观察一致特征。通过系统改变合金化学成分来改变泊松比的其他许多Fe-BMG变体,具有更高的韧性,但数据分散性更高,反映出较低的威布尔模量。 SEM检查表明,对于给定的化学性质,样品中的夹杂物总是发生断裂起始,表现出较低的韧性和/或威布尔模量。讨论了这些观察结果对BMG可靠性的影响。

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