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Hard glass is harder than steel

Font Size: [Big][Mid][Small] 2017/4/12    Views: 898    
Can a glass be stronger and stronger than steel? A new type of tolerant metallic glass has proven to be beyond the strength and toughness of any known material, the DOE, the Lawrence Berkeley National Laboratory and the California Institute of Technology The researchers collaborated to test this new discovery. Even more surprising is that the glass seems to be ready for everyday use.
Can a glass be stronger and stronger than steel? A new type of tolerant metallic glass has proven to be beyond the strength and toughness of any known material, the DOE, the Lawrence Berkeley National Laboratory and the California Institute of Technology The researchers collaborated to test this new discovery. Even more surprising is that the glass seems to be ready for everyday use.
"Our findings mark the first strategic use of the manufacture of metallic glass, and we believe that this process can be used to make stronger and more tough glass products." The Berkeley Laboratory Materialist, who presided over the study Said Robert Ritchie. This new type of metallic glass incorporates trace amounts of palladium, a hard metal element with an ultra-high "volume shear rate" that counteracts the inevitable fragile fragility of the glass material.
"The energy required for the shear band formation is much lower than that of the shear zone, which is the energy of the gap," Ritchie explains. "This leads to this glass Has a super plasticity, able to resist the huge impact, this impact can only make it bend, not broken.
Hard glass is harder than steel
Ricky is a co-founder of the Berkeley Laboratory Materials Division and the University of California, Berkeley, Department of Materials Science and Engineering. The findings are published in the journal Nature, and Professor Ritchie is also one of the authors.
The glass material has an amorphous, amorphous structure that makes them extremely strong, but also extremely fragile, and the crystalline structure of the metal can provide resistance to fragmentation (including some impurities, grain boundaries, etc.) Inhibit the formation of fractures and expand. And the glass does not have this crystal structure, it can not stop the crack crack propagation. And this problem in the metal glass is even more sharp, even if a small shear band can be under the action of a weak force in the catastrophic expansion.
In the early research work, in the Berkeley laboratory and the California Institute of Technology under the cooperation, to create known as the "DH3" metal glass, in which the metal phase of the intervention can block the crack propagation. This metal crystal phase takes the form of dendrites into the amorphous structure of the glass to prevent the crack from spreading into an open gap. In this new process, the collaborators produced a pure glass material whose unique chemical composition played a role in promoting the formation of cracks through the formation of multiple shear bands.
"The game we play with the crack is to extend the breadth of the cracks as much as possible through the synthesis of other glass metals, so that the entire material before the break has a stronger plasticity changes." Rich said, "In addition, the palladium can provide excellent , The unusual shielding ability, has a magical effect in dealing with the open crack of the amorphous material, which gives our metallic glass a toughness comparable to that of the hardest known metal. This rugged and tough A rare combination of toughness, or resistance to damage, goes beyond the hardest and rugged material range we know. "
The original sample of new glass material was mixed with trace palladium elements containing phosphorus, silicon and germanium to obtain a glass rod of about one millimeter in diameter, and later the researchers at the California Institute of Technology added silver elements to extend the thickness of the glass rod to Six millimeters. The size of this metal glass is limited, must be quickly cooled or "quenched" in order to get the final amorphous liquid metal.
"Our experience is that in order to make metal glass, we need at least five elements, so that when we cool the material, it does not know what crystal structure to sort, and thus have an amorphous state." Ritchie said.
"The traditional view is that the strength and toughness of the material is a pair of mutually exclusive properties, which makes our metal glass with the challenge of human intelligence.We are in the counter-current line, the hard properties of the glass in the metal Resistance to the ductility of the envelope. "
The results of this research have been identified and tested at the US Department of Energy's Science Office to support the California Institute of Technology's manufacturing work by the National Science Foundation.

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