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Ductility and Impact Resistance of Powder-Metallurgical Molybdenum-Rhenium Alloys
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Mo-Re alloys containing between 5 and 47.5 wt pct Re were fabricated from Mo and Mo-Re powders by sintering and hot radial forging. The mechanical properties of as-forged, stress-relieved, and recrystallized specimens were examined. Up to a concentration of 41 wt pct Re. the Charpy ductileto-brittle transition temperature decreased monotonically with increasing rhenium concentration. Consistent with this, bend angles for fracture at T = -100 °C increased monotonically with increasing rhenium...
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Ductility and Impact Resistance of Powder-Metallurgical Molybdenum-Rhenium Alloys
Metallurgical and Materials Transactions
; Mo-Re alloys containing between 5 and 47.5 wt pct Re were fabricated from Mo and Mo-Re powders by sintering and hot radial forging. The mechanical properties of as-forged, stress-relieved, and recrystallized specimens were examined. Up to a concentration of 41 wt pct Re. the Charpy
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Thermal transformations in mechanically alloyed Fe-Zn-Si materials
Metallurgical and Materials Transactions
; The ball milling of elemental powders corresponding to F (Fe3Zn10) + 0.12 wt pct Si; F, (Fe5Zn21) + 0.12 wt pct Si; 5 (FeZn7) + 0.12 wt pct Si; and ' (FeZn13) + 0.12 wt pct Si composition ratios yields crystalline, mechanically alloyed phases. Differential scanning calorimetry (DSC) measurements of
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The Microstructural, Mechanical, and Fracture Properties of Austenitic Stainless Steel Alloyed with Gallium
Metallurgical and Materials Transactions
; The mechanical and fracture properties of austenitic stainless steels (SSs) alloyed with gallium require assessment in order to determine the likelihood of premature storage-container failure following Ga uptake. AISI 304 L SS was cast with 1, 3, 6, 9, and 12 wt pct Ga. Increased Ga concentration
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Deformation and Fracture Behavior of Rapidly Solidified and Annealed Iron-Silicon Alloys
Metallurgical and Materials Transactions
; In this study, the mechanical properties, deformation behavior, and fracture modes of iron-silicon melt-spun ribbons are related to changes in silicon composition from 4.5 to 6.5 wt pct and the influence of ordering phase transformations. The as-solidified melt-spun ribbons, which exhibit
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Mutual effects of hydrogenation and deformation in Ti-Nb alloys
Metallurgical and Materials Transactions
; Alloying of Ti-based alloys with hydrogen is used to modify the microstructure and improve mechanical properties. In this study, hydrogen charging was performed electrochemically in a 2:1 glycerinphosphoric acid electrolyte at high fugacities. This research investigated in detail, by means of X-ray
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Precipitation processes in Al-Cu-Mg alloys microalloyed with Si
Metallurgical and Materials Transactions
; Microalloying additions of Si are known to increase significantly the response to age hardening of 2xxx series Al-Cu-Mg alloys, and commercial alloys such as 2618 are based on this effect. Previous work has attributed this effect to a refined dispersion of S' or S phase (Al2CuMg) precipitates. This
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Grain refining of Al-4.5Cu alloy by adding an Al-30TiC master alloy
Metallurgical and Materials Transactions
; A particulate Al-30 wt pct TiC composite was employed as a grain refiner for the Al-4.5 wt pct Cu alloy. The composite contains submicron TiC particles. The addition of the TiC grain refiner to the metal alloy in the amount of 0.1 Ti wt pct effected a remarkable reduction in the average grain size
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The Influence of Strontium on Porosity Formation in Al-Si Alloys
Metallurgical and Materials Transactions
; Strontium modification is known to alter the amount, characteristics, and distribution of porosity in Al-Si castings. Although many theories have been proposed to account for these effects, most can be considered inadequate because of their failure to resolve contradictions and discrepancies in the
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The critical amount of nitrogen on the formation of nitrogen gas pores during solidification of 25Cr-7Ni duplex stainless steels
Metallurgical and Materials Transactions
; The effects of casting thickness, nitrogen contents, cooling rate, and Mn contents on the formation of nitrogen gas pores during solidification of 25Cr-7Ni-1.5Mo-3W duplex stainless steels (DSS) were quantitatively investigated. In the case of a sand mold, the formation of nitrogen gas pore was not
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Improved Homogenization of Ni in Sintered Steels through the Use of Cr-Containing Prealloyed Powders
Metallurgical and Materials Transactions
; The homogenization of Ni in powder metal (PM) steel compacts is usually difficult even after high-temperature sintering at 1250 C. An earlier study by the authors demonstrated that this problem can be alleviated through the addition of 0.5 wt pct Cr in the form of stainless steel powders. To
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