Brittle-Ductile Transition in Laser 3D Printing of Fe-Based Bulk Metallic Glass Composites

被引：10

作者：

Xie, Fei ^{[1
]}

Chen, Qingjun ^{[1
]}

Gao, Jiwen ^{[2
]}

机构：

[1] Nanchang Hangkong Univ, Sch Mat Sci & Engn, Nanchang 330063, Jiangxi, Peoples R China

[2] Nanchang Hangkong Univ, Sch Civil Engn, Nanchang 330063, Jiangxi, Peoples R China

来源：

METALS | 2019年 / 9卷 / 01期

基金：

中国国家自然科学基金;

关键词：

laser 3D printing; bulk metallic glass; nanoindentation; crack; plasticity; MECHANICAL-PROPERTIES; ELASTIC-MODULUS; WEAR BEHAVIOR; HIGH-STRENGTH; HARDNESS; MICROSTRUCTURE; INDENTATION; PROPAGATION; ALLOYS;

D O I：

10.3390/met9010078

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of the alpha-Fe phase on mechanical properties and cracking of laser 3D printing Fe-based bulk metallic glass composites were investigated. The elastic recovery and plasticity index were characterized by nanoindentation. As the volume fraction of the alpha-Fe phase increases from 23.66% to 52.38%, the elastic modulus of printed samples suddenly drops. The samples exhibit a lower deformation resistance, and the plasticity index increases gradually. When the volume fraction of the alpha-Fe phase is 67.84%, the interaction between the alpha-Fe phase and matrix phase is smaller during expansion shrinkage. As a result, cracking is easy to initiate, which leads to the highest crack rate of the printed sample. However, as the volume fraction of the alpha-Fe phase increases to 83.31%, the hard brittle phase was sandwiched between the alpha-Fe phases similar to the finger structure plays key role in the plastic deformation. The plastic deformation releases large amounts of stress concentrated at the boundary and suppresses crack formation.

引用

页数：13

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