New Ll&lt;SUB&gt;2&lt;/SUB&gt; Ordered Alloys having the Positive Temperature Dependence of Strength

Wee, Dang-Moon; Noguchi, Osami; Oya, Yoshihiro; Suzuki, Tomoo

doi:10.2320/matertrans1960.21.237

Cited by 168 publications

(40 citation statements)

References 26 publications

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“…Recently [8], the present authors found that most of platinum-based L12 alloys with B-subgroup elements have a positive temperature dependence of strength as well as the nickel-based L12 alloys with B-subgroup elements. In addition, they have shown that, depending on the atomic radius ratio of the components, the magnitude of the positive temperature dependence of strength of binary LI~ alloys is systematically changed at a constant electron concentration [9], (see Fig. 7 of [9], which is reproduced in Fig.…”

Section: Introductionmentioning

confidence: 97%

The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

Suzuki

Oya

1981

J Mater Sci

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The notable effect of atomic radius ratio of the components of L12-0rdered alloys on the temperature dependence of their strength has been demonstrated using suitable alloys and alloying elements. Pt3 In and Pt3Sn were chosen and partial substitutions were made of the minor components with Ga and TI, and with Ge and Pb, respectively, keeping the electron concentration of the system constant. The positive temperature dependence was generally found to be strengthened by the smaller substituting atoms and to be weakened by the larger atoms. On the other hand, the substitution of In was found to strengthen the anomalous behaviour of Pt3 Ga. Thus, a maximum anomalous strengthening is achieved with an In-rich Pt3(I n, Ga) alloy, which forms a continuous solid solution with a L12 structure. All these effects are consistent with the model obtained previously by experiments on binary L12 alloys and are correlated to the radiusratio rule, which leads to the change of phase stability of L12 alloys.

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Section: Introductionmentioning

confidence: 97%

The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

Suzuki

Oya

1981

J Mater Sci

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“…The identification of a single L1 2 phase field across this quaternary system offers the prospect of new Ni-Co-based superalloys that may take advantage of the benefits of elevated Co and Ti levels in nickel-base superalloys. In particular, it is known that the intermetallic L1 2 Co 3 Ti phase possesses an increased strength over Ni 3 Al above 730 °C [5]. Nickel based superalloys with high Co and Ti levels may therefore be anticipated to possess higher strength in this temperature regime.…”

Section: Introductionmentioning

confidence: 99%

A1-L1<sub>2</sub> Structures in the Al-Co-Ni-Ti Quaternary Phase System

Minshull

Neumeier

Tucker

et al. 2011

AMR

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The phase constituents of alloys from the (Ni,Co) 85 (Al,Ti) 15 plane of the Ni-Co-Al-Ti quaternary system were investigated following prolonged exposure at 750°C. Microstructural investigations confirmed the existence of a continuous A1-L1 2 two-phase region in the Ni-Co-Al-Ti quaternary system between Ni-Ni 3 Al and Co-Co 3 Ti. The lattice misfits of alloys from this quaternary system were determined using neutron diffraction. With increasing contents of Ti the positive lattice misfit increases up to +0.79% in the Ti-containing alloys, which leads to an increasing tetragonal distortion of the γ matrix phase due to the increasing coherency stresses.

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“…2. In this figure, data of a cast Ni3Al, taken from a previous work (4), are also shown as a reference. The strength level of the sintered Ni3AI is much greater, for example, by a factor of seven at 77K, than that of the cast Ni3Al.…”

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confidence: 99%