|Shear-band toughness of bulk metallic glasses|
|Jiang MQ(蒋敏强); Dai LH(戴兰宏); Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
|Source Publication||ACTA MATERIALIA
|Abstract||Dynamic "forced" shear and quasi-static tensile tests were performed on a typical Vitreloy 1 bulk metallic glass (BMG). The nanoscale shear band is found to initiate in a local plastic region, then propagates with a well-defined front. A theoretical model that takes into account momentum, energy and free-volume balance is developed to quantitatively describe the dissipation system of shear-band propagation in the local plastic region. The analytical expressions for shear-localization time, shear-band thickness and critical energy dissipated within the band are obtained. Calculations demonstrate that the shear-band propagation process is dominated by the free-volume softening, rather than the thermal softening. The latter increases the band thickness slightly but decreases the corresponding critical dissipation energy somewhat. The concept of shear-band toughness is further introduced to measure the inherent resistance capability of materials to the propagation of shear bands in BMGs. These results assist in more comprehensively understanding the evolution mechanism of the shear bands, and in guiding alloy design to enhance the toughness of BMGs. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.|
|Keyword||Bulk Metallic Glass
|Subject Area||Materials Science
; Metallurgy & Metallurgical Engineering
|Funding Organization||The authors are grateful to Dr. H.S. Zhang and Dr. H.L. Li for their assistance in dynamic tests and AFM observations, respectively. Financial support is from the NSFC (Grant Nos. 10725211, 11002144, 11023001 and 11021262), National Natural Science Foundation of China-NSAF (Grant No. 10976100), the National Basic Research Program of China (Grant No. 2009CB724401) and the Key Project of Chinese Academy of Sciences (No. KJCX2-YW-M04). We are very grateful to two anonymous reviewers for their helpful comments, which have improved our manuscript significantly.
|Corresponding Author||Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China|
Jiang MQ,Dai LH,Dai, LH . Shear-band toughness of bulk metallic glasses[J]. ACTA MATERIALIA,2011,59(11):4525-4537.
Jiang MQ,Dai LH,&Dai, LH .(2011).Shear-band toughness of bulk metallic glasses.ACTA MATERIALIA,59(11),4525-4537.
Jiang MQ,et al."Shear-band toughness of bulk metallic glasses".ACTA MATERIALIA 59.11(2011):4525-4537.
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