The ductile-brittle transition in polycrystalline molybdenum

Wronski, A. S.; Chilton, A.C.; Capron, E.M

doi:10.1016/0001-6160(69)90081-9

Cited by 54 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with i) experimental investigations which show that Nb and Ta dogbone samples have significantly higher elongations to fracture in tensile tests than Mo and W, respectively [40][41][42][43] and ii) evidence of a significantly higher ductile-to-brittle-transition temperature in Mo and W compared to Nb and Ta [44][45][46][47][48] . Table I shows an interesting trend, namely commercially pure W and Mo having significantly less tensile elongation (1-5 % and 10-15 %, respectively) than Ta and Nb (70 % and 50 %, respectively).…”

Section: A Elastic Instabilities and Intrinsic Ductilitysupporting

confidence: 89%

Ideal strength and ductility in metals from second- and third-order elastic constants

et al. 2017

View full text Add to dashboard Cite

Under tensile loading the ideal strength of a solid is governed by mechanical instabilities corresponding to failure in tension or shear, indicative of intrinsically brittle or ductile behavior, respectively. Ideal-strength first-principles calculations are performed in this work on several hexagonalclose-packed (hcp) and body-centered-cubic (bcc) metals. It is shown that some metals fail in tension under uniaxial loading, whereas others fail in shear. The observed behavior is rationalized with a simple analytical model based on second-order and third-order elastic constants. This formalism correctly predicts the failure mode of all but one of the metals studied in this work and leads to fundamental new insights into why some classes of metals are intrinsically brittle or ductile. Further, for the transition metals, filling of the d-bands is shown to correlate with the type of mechanical instability encountered, thus providing new insights into the effect of alloying on the intrinsic mechanical behavior of hcp and bcc metals.

show abstract

Section: A Elastic Instabilities and Intrinsic Ductilitysupporting

confidence: 89%

Ideal strength and ductility in metals from second- and third-order elastic constants

et al. 2017

View full text Add to dashboard Cite

show abstract

“…There are several publications dealing with the BDT or the temperature-dependent mechanical properties of Mo and its alloys [18,[20][21][22][23][24][25][26][27]. In the most studies, tensile or impact tests were carried out.…”

Section: Introductionmentioning

confidence: 99%

Thermally activated dislocation mechanism in Mo studied by indentation, compression and impact testing

Minnert

Rehman

Durst

2021

Journal of Materials Research

View full text Add to dashboard Cite

Body-centered cubic metals like molybdenum and tungsten are interesting structural materials for high-temperature applications. These metals, are however, brittle at low homologous temperature, caused by the limited mobility of screw dislocations. In this study, the thermally activated deformation mechanisms in bcc Mo have been investigated using strain rate jump nanoindentation and compression tests as well as Charpy V-notch impact testing. The material shows a significant softening with increasing temperature and a maximum in strain rate sensitivity is found at the critical temperature, before decreasing again in the ductile regime. The activation volume, however, showed a distinct increase from about 5 b3 at the onset of the brittle to ductile transition temperature. Here we propose to use temperature-dependent nanoindentation strain rate jump testing and the activation volume as a complementary approach to provide some indication of the brittle to ductile transition temperature of bcc metals. Graphic Abstract

show abstract

“…The mechanical properties of a BCC metal are most drastically affected in the region around the brittle-ductile transition (BDT). Many BCC metals have BDT temperatures (BDTTs) around or below room temperature [25][26][27]. In addition, the BDT is an important consideration for structural materials; neglecting the BDT can have disastrous effects, such as the famous catastrophic hull failures of steel Liberty Ships during World War II [28].…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent mechanical behavior of three-dimensionally ordered macroporous tungsten

et al. 2020

View full text Add to dashboard Cite

show abstract

The ductile-brittle transition in polycrystalline molybdenum

Cited by 54 publications

References 8 publications

Ideal strength and ductility in metals from second- and third-order elastic constants

Ideal strength and ductility in metals from second- and third-order elastic constants

Thermally activated dislocation mechanism in Mo studied by indentation, compression and impact testing

Temperature-dependent mechanical behavior of three-dimensionally ordered macroporous tungsten

Contact Info

Product

Resources

About