Solid-Solution-Hardening of Tantalum-Base Alloys

Mordike, B. L.; Rogausch, K. D.; Braithwaite, A.A.

doi:10.1179/msc.1970.4.1.37

Cited by 11 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of the early work on yield behavior of Ta complex nature and movement of screw dislocations. The single crystals can be seen in publications by Mitchell and mobility of the ͗111͘ screw dislocations is reduced due Spitzig [10,11] and Mordike et al; [8] some of the more recent to the threefold splitting of these dislocations along three studies have been performed by Wasserbäch. [12,13] In addidistinct {110} planes, resulting in somewhat ill-defined slip tion to work on single crystals, studies on the yield behavior planes at elevated temperatures, as discussed in a review of polycrystalline Ta materials have been published by Hoge by Duesbery and Vitek.…”

Section: Introductionmentioning

confidence: 96%

“…[1][2][3][4][5][6] The main distinguishing feature of bcc more prevalent with substitutional alloying, therefore makmetals and alloys is their strong temperature and strain-rate ing it difficult to define T c and a value for the athermal stress dependence of both yield and flow stresses at temperatures for many alloys. [8,9] below about 300 to 400 K, indicating significant contribuOur fundamental knowledge about the deformation tions of thermal activation to dislocation movement over behavior in bcc metals and alloys, as summarized preshort-range barriers. This strong temperature dependence viously, has been gained mostly from studies on single is attributed to the high Peierls barriers associated with the crystals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of grain boundaries on the athermal stress of tantalum and tantalum-tungsten alloys

Lassila

Goldberg

Becker

2002

Metall Mater Trans A

View full text Add to dashboard Cite

The temperature dependence of the yield stress of polycrystalline Ta, Ta-2.47 wt pct W (Ta-2.5W), and Ta-9.80 wt pct W (Ta-10W) was measured to study the effect of grain boundaries and tungsten concentration on athermal strength components. Compression tests were performed over a temperature range from 77 to 1223 K at strain rates of 10 Ϫ4 and 10 Ϫ1 s Ϫ1 . The test results show that the yield stress of Ta becomes independent of temperature above about 400 K, indicating an "athermal" regime. In contrast, the temperature dependence of yield stress was still significant for Ta-10W up to the maximum test temperature. An analysis of the test data using single-crystal data in conjunction with Taylor factors was performed to assess the effect of grain boundaries on the athermal component of flow stress at 600 K. The results indicated that the long-range athermal stress at the yield point due to grain boundaries is approximately 13 to 41 MPa for the study materials and decreases with an increase in tungsten concentration. These results are discussed with regard to constitutive modeling of flow stress.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

The effect of grain boundaries on the athermal stress of tantalum and tantalum-tungsten alloys

Lassila

Goldberg

Becker

2002

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

Athermal solid solution hardening in niobium alloy single crystals

Mordike

1976

Phys. Stat. Sol. (a)

Self Cite

View full text Add to dashboard Cite

Solid solution hardening is studied on single crystals of NbRe, NbTa, NbMo, and NbW over the temperature range 77 to 2000 K. The behaviour at high temperatures is described in terms of elastic interaction parameters: size effect ϵb and modulus effect ϵG. There sults are discussed together with those of a previous investigation on tantalum base alloys. Solid solution hardening in both systems is well described by the Labusch relationship.

show abstract