Relating fracture toughness to micro-pillar compression response for a laser powder bed additive manufactured bulk metallic glass

被引：50

作者：

Best, James P. ^{[1
,6
]}

Ast, Johannes ^{[2
,7
]}

Li, Bosong ^{[1
]}

Stolpe, Moritz ^{[3
,4
]}

Busch, Ralf ^{[4
]}

Yang, Fan ^{[5
]}

Li, Xiaopeng ^{[1
]}

Michler, Johann ^{[2
]}

Kruzic, Jamie J. ^{[1
]}

机构：

[1] UNSW Sydney, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia

[2] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, Feuerwerkerstr 39, CH-3602 Thun, Switzerland

[3] Heraeus Addit Mfg GmbH, Heraeusstr 12-14, D-63405 Hanau, Germany

[4] Saarland Univ, Chair Metall Mat, Campus C6-3, D-66123 Saarbrucken, Germany

[5] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

[6] Rhein Westfal TH Aachen, Inst Met & Mat Phys, Kopernikusstr 14, D-52074 Aachen, Germany

[7] Fraunhofer Inst Keram Technol & Syst IKTS, Aussere Nurnberger Str 62, D-91301 Forchheim, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 770卷

基金：

澳大利亚研究理事会;

关键词：

Additive manufacturing; Selective laser melting; Micromechanics; Fracture toughness; Amorphous materials; Metallic glass; SHEAR BANDS; MECHANICAL-BEHAVIOR; FREE-VOLUME; PLASTICITY; INITIATION;

D O I：

10.1016/j.msea.2019.138535

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A Zr-based bulk metallic glass produced using selective laser melting (SLM) was compared to the same alloy fabricated using traditional suction-casting. Analysis of the fracture toughness through single edge notched beam bending experiments showed a significantly reduced damage tolerance for the laser-processed material (K-Q similar to 138.0 +/- 13.1 -> 28.7 +/- 3.7 MPa root m), even though X-ray diffraction and microhardness responses were identical. Using uniaxial quasistatic micro-pillar compression, it was found that as-cast samples more readily underwent shear transformations (evidenced through discrete load drops) below the nominal 0.2% yield stress, which was connected to the higher macroscopic toughness. Differential scanning calorimetry demonstrated that the increased barrier to shear transformation for the SLM material could not be explained by the relative relaxation states. Rather, it was attributed to the greater dissolved oxygen concentration in the laser-processed material, which is postulated to decrease atomic mobility in the structure and thereby increase the activation energy required to initiate shear transformations.

引用

页数：8

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