Uranium-zinc system

Chiotti, P.; Klepfer, H.H.; Gill, K.J.

doi:10.1007/bf03398450

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…In our case, most of the data were found in the review of Gschneidner [13]. These data were supplemented in a few cases with more current results: a-Pu [14,15], 8-Pu [J 6], £-Pu [17] y-U [18,19] and y-Ce [20]. In the case of 8-Pu, the anomalous thermal expansion believed to result from an invar effect were subtraction, as explained in lI6], which discusses a series of Pu-Ga alloys.…”

Section: Entropy Melting Point and Atomic Vibrationsmentioning

confidence: 76%

Physics of the Lindemann melting rule

Lawson

2009

Philosophical Magazine

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We investigate the thermodynamics of melting for 74 distinct chemical elements including several actinides and rare earths. We find that the observed melting points are consistent with a linear relationship between the correlation entropy of the liquid and the GrUneisen constant of the solid, and that the Lindemann rule is well obeyed for the elements with simple structures and less well obeyed for the less symmetric more open structures. No special assumptions are required to explain the melting points of the rare earths or light actinides.

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Section: Entropy Melting Point and Atomic Vibrationsmentioning

confidence: 76%

Physics of the Lindemann melting rule

Lawson

2009

Philosophical Magazine

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“…Uranium with a melting point of approximately 1132 °C has three phases: y (775-1132 °C) is cubic-c/2, f3 (668-775 °C) is complex tetragonal-tP30, with 30 atoms per unit cell and a (below 668 °C) is orthorhombic-c04 (Burke et al, 1976). As determined by X-ray measurements, the y->/3 and (3->a transitions are accompanied by volume decreases of 0.70% and 1.12%, respectively (Chiotti et al, 1959). Studies with pure uranium have shown that neither of the high temperature phases, y or f3, could be retained by quenching.…”

Section: Introductionmentioning

confidence: 98%

X-ray diffraction characterization of microstrain in some uranium alloys

Kimmel¹,

Dayan²

1998

Powder Diffr.

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Taking advantage of the feasibility to obtain well-prepared surfaces, an extensive work has been done in studying X-ray diffraction line broadening effects from flat polycrystalline samples of uranium and uranium alloys. The broadening analysis has been used as a semiquantitative method for measuring inhomogeneity of alloying, hardness, and residual thermal stresses. Good correlation between the microstrain and the hardness was found after heat treatments and cold work. A comparable correlation was found between the microstrain in the supersaturated a-uranium phase quenched from the y region, and the concentration of the alloying elements. The measured microstrain in the supersaturated a-uranium phase was used as a quantitative value for determination of the solubility limit of Ta and W in y-uranium. As a result of this study it was found that the limit of solubility is approximately 2.6 and 2.0 at. % for Ta and W, respectively. © 1998 International Centre for Diffraction Data. [S0885-7156(97)

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The lost-foam casting of aluminum alloy components

Shivkumar

Wang

Apelian

1990

JOM

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In the lost-foam casting process, liquid metal is poured directly onto a refractorycoated, foamed polymer pattern which is buried in loose sand. The polymer pattern undergoes thermal degradation and is gradually replaced by the molten metal, which solidifies and produces the casting. The inherent operating advantages of this innovative technique have generated considerable interest among casting manufacturers. Currently, the process is being utilized to manufacture a wide variety of ferrous and nonferrous components catering primarily to the automotive industry. Because the process is relatively new, there is a compelling need to quantify the influence of process parameters on microstructure and mechanical properties. Furthermore, the interaction of the thermal degradation products with the solidifying metal may produce several unique defects in the casting.

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Uranium-zinc system

Cited by 4 publications

References 1 publication

Physics of the Lindemann melting rule

Physics of the Lindemann melting rule

X-ray diffraction characterization of microstrain in some uranium alloys

The lost-foam casting of aluminum alloy components

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