Effects of cryogenic temperatures on mechanical behavior of a Zr60Ni25Al15 bulk metallic glass

Li, Y.H.; Zhang, W.; Chen, Dong; Kawashima, A.; Makino, Akihiro; Liaw, Peter K.

doi:10.1016/j.msea.2013.06.063

Cited by 31 publications

(13 citation statements)

References 25 publications

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“…In addition, a clear increase of the mechanical strength can be observed from about 1400 MPa at 295 K to 1700 MPa at 77 K. reported in the literature [5,[10][11][12][13]26]. It has been proposed that the strengthening at cryogenic temperatures may be attributed to structural densification related with the reduction of atomic radii through the reduction of thermal atomic fluctuations and to increased bond strengths at low temperatures [5,[11][12][13]26]. In addition, such behaviour may be related to the reduced mobility of STZs, which are thermally hindered from assuming positions conductive to cooperative shear [12].…”

Section: Resultssupporting

confidence: 53%

“…These values of plastic deformation at cryogenic temperatures are remarkable for BMGs, which are known to exhibit very limited plastic strains under tensile loading. In addition, a clear increase of the mechanical strength can be observed from about 1400 MPa at 295 K to 1700 MPa at 77 K. reported in the literature [5,[10][11][12][13]26]. It has been proposed that the strengthening at cryogenic temperatures may be attributed to structural densification related with the reduction of atomic radii through the reduction of thermal atomic fluctuations and to increased bond strengths at low temperatures [5,[11][12][13]26].…”

Section: Resultsmentioning

confidence: 82%

“…It has been proposed that the strengthening at cryogenic temperatures may be attributed to structural densification related with the reduction of atomic radii through the reduction of thermal atomic fluctuations and to increased bond strengths at low temperatures [5,[11][12][13]26]. In addition, such behaviour may be related to the reduced mobility of STZs, which are thermally hindered from assuming positions conductive to cooperative shear [12]. Between 150 and 295 K, there happens an apparent reversal of strain rate sensitivity with regards to yield stress.…”

Section: Resultsmentioning

confidence: 99%

“…Lowered temperature is generally predicted to increase strength. Several experimental studies have looked at different BMG alloys in cryogenic conditions, reporting increases in yield strength [11][12][13] and plasticity [11,12,14]. Some report the concentration of deformation into one major shear band rather than several minor ones at low temperatures and strain rates [10,15].…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties of Zr70Ni16Cu6Al8 BMG at room and cryogenic temperatures

Brennhaugen

Georgarakis

Yokoyama

et al. 2018

Journal of Alloys and Compounds

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The mechanical behaviour in tension of a hypoeutectic Zr 70 Ni 16 Cu 6 Al 8 Bulk Metallic Glass (BMG) was studied at room (295K) and cryogenic temperatures (150 K and 77K) using various strain rates between 10 -4 and 10 -1 s -1 . The yield strength was found to increase at lower temperatures with average values increasing by 16 %, from 1503 MPa at 295 K to 1746 MPa at 77 K. The Zr-based BMG was found to exhibit tensile plastic elongation of about 0.4% before fracture at room temperature and high strain rates (10 -1 s -1 ). Even higher tensile plasticity was recorded at low temperatures; plastic deformation was found highest at the intermediate temperature (150K) reaching remarkable plastic strains in the order of 3.9 %, while values up to 1.5% were recorded at 77 K. The lateral surface of the tensile specimens was observed in-situ during deformation using a high frame rate camera offering interesting insights with regard to the deformation mechanisms. Room temperature plasticity occurred through the formation and interaction of several nucleated shear bands before critical failure, while at intermediate and liquid nitrogen temperatures, most of the plastic deformation was accommodated through stable flow within a single shear band.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tensile properties of Zr70Ni16Cu6Al8 BMG at room and cryogenic temperatures

Brennhaugen

Georgarakis

Yokoyama

et al. 2018

Journal of Alloys and Compounds

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show abstract

“…Bulk metallic glasses (BMGs) have aroused wide research interests for their potential application value as engineering structural materials due to their excellent mechanical, physical and chemical properties [1][2][3]: high strength; high hardness; high strength to weight ratio; superior elastic limit; low coefficient of friction; high scratch and wear resistance; good corrosion resistance; net-shape castability; high luster surfaces and good soft magnetic behavior, etc. However, lack of plasticity makes BMGs prone to catastrophic failure in load-bearing conditions and restricts their widespread applications [4].…”

Section: Introductionmentioning

confidence: 99%