NDLI: ZrB$_{2}$ nanoparticle induced nano-LPSO-grain and nano-LPSO-layer reinforced ultra-high strength Mg

Content Provider	Springer Nature Link
Author	Paramsothy, Muralidharan Gupta, Maj
Copyright Year	2013
Abstract	ZrB$_{2}$ nanoparticles were used to modify a selected solidification processed Mg–RE alloy to give it ultrahigh strength (tensile yield strength >400 MPa). This approach did not involve time consuming and therefore cost incurring stages such as (1) ingot solutionizing and quenching prior to hot extrusion as well as (2) thermal aging beyond 24 h after hot extrusion. Rather, the ZrB$_{2}$ nanoparticle induced finer LPSO phase (nano-LPSO-layer) formation due to nano-surface effects and the consequent nucleating effects of the fibrous LPSO ends during hot extrusion resulted in the formation of nanograins. Alternatively, free zirconium from ZrB$_{2}$ nanoparticles reacting with the magnesium matrix may have had a significant nanoscale grain refining effect on the alloy. During the 24 h period of lower temperature (200 °C) thermal aging in this study, the LPSO phase formed in nanograins containing sufficient dissolved Gd, Y, and Zn, this being nano-LPSO-grain formation which “auto-locked” the nanoscale grain size during thermal aging due to the thermal stability of the high melting point rare earth containing LPSO phase. Compared to the surrounding alloy matrix, the nano-LPSO-grain cluster with random grain striation orientation was more robust. This was confirmed by the observation of predominantly non-basal or 〈c+a〉 type dislocations requiring higher CRSS around as well as within the room temperature tensile deformed nano-LPSO-grains. The LPSO phase generally constricted the flow of dislocations during deformation. The nano-LPSO-layer also acted as finely divided nanoscale reinforcement for the alloy matrix, including nanoscale strengthening of selected micrograin boundaries by bridging. The higher robustness of the nano-LPSO-grain cluster (and nano-LPSO-layer), good stress transfer characteristics across the nano-LPSO-grain boundary (and nano-LPSO-layer–alloy matrix interface), and nanoscale bridging across selected micrograin boundaries by nano-LPSO-layers contributed to the ultra–high strength characteristic (tensile yield strength >400 MPa) of the selected Mg–RE alloy.
Starting Page	8368
Ending Page	8376
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	48
Issue Number	24
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2013-08-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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