Semiatin, S. L. Levkulich, N. C. Larsen, R. Tiley, J. S. Wertz, K. N. Zhang, F. Smith, T. M. Zhang, R. Y. Dong, H. B. Gadaud, P.
...
Published in
Metallurgical and Materials Transactions A
A suite of experimental tools and fast-acting, numerical-simulation techniques was used to quantify the precipitation behavior of three nickel-base superalloys: IN-100, LSHR, and 718. Experimental methods comprised differential scanning calorimetry (DSC) to establish the specific heat as a function of temperature and selected direct-resistance heat...
Wei, Chengbin Li, Linwei Lu, Yiping Du, Xinghao Wang, Tongmin
Published in
Metallurgical and Materials Transactions A
This study designed a series of low-cost AlxCrFe2Ni2 high-entropy alloys with different Al contents (x = 0.1-1.0 at.) and investigated their microstructure and mechanical properties. The XRD analysis revealed that, with an increase in the Al content, their crystalline structures changed from the initial single face-centered cubic (FCC) one to FCC p...
Quintana, Maria J. Kenney, Matthew J. Agrawal, Priyanka Collins, Peter C.
Published in
Metallurgical and Materials Transactions A
A limited number of features that comprise the more wholistic materials state of electron beam, powder bed additively manufactured Ti-6Al-4V have been investigated. Coupling scanning electron microscopy and orientation microscopy, the microstructure and texture of samples produced using different AM scan strategies have been studied at various posi...
Carluccio, D. Demir, A. G. Bermingham, M. J. Dargusch, M. S.
Published in
Metallurgical and Materials Transactions A
The aim of this paper is to assess the current status of processing biodegradable metals (BDM) via selective laser melting (SLM), with particular emphasis on bone scaffold applications, and provide a meta-analysis on the effect of processing parameters on relative density to better direct recommendations for the future of this growing field. Synthe...
Martin, Alexander C. Oliveira, João Pedro Fink, Carolin
Published in
Metallurgical and Materials Transactions A
Weld solidification and weldability of AlxCoCrCuyFeNi high-entropy alloys (HEA) were characterized as a function of Al and Cu molar ratio in the alloy composition. Autogenous gas tungsten arc welding (GTAW) was performed on the as-melted ingots. Fusion zone and heat-affected zone microstructures were investigated using optical and electron microsco...
Valloton, J. Bogno, A.-A. Henein, H. Herlach, D. M. Sediako, D.
Published in
Metallurgical and Materials Transactions A
This paper reports on the undercooling and growth morphology of Al-4.5 wt pct Cu and Al-4.5 wt pct Cu-0.4 wt pct Sc with a focus on the effect of Sc addition. It is found that the addition of Sc reduces the undercoolings of both primary phase and eutectic. In addition, the morphology of the Al-4.5 wt pct Cu-0.4 wt pct Sc dendrites is less favored i...
Phillion, A.B. Lee, P.D. Maire, E. Cockcroft, S.L.
Published in
Metallurgical and Materials Transactions A
Semisolid tensile testing combined with X-ray microtomography (XMT) was used to characterize the development of internal damage as a function of strain in an aluminum-magnesium alloy, AA5182. Novel techniques were developed to allow the quantification of both the size evolution and orientation of the damage to determine mechanisms controlling the e...
Mokadem, S. Bezençon, C. Hauert, A. Jacot, A. Kurz, W.
Published in
Metallurgical and Materials Transactions A
The casting and repair of single-crystal gas turbine blades require specific solidification conditions that prevent the formation of new grains, equiaxed or columnar, ahead of the epitaxial columnar dendrites. These conditions are best determined by microstructure modeling. Present day analytical models of the columnar-to-equiaxed transition (CET) ...
Raynova, Stella Collas, Yan Yang, Fei Bolzoni, Leandro
Published in
Metallurgical and Materials Transactions A
High-frequency induction heating is applied as an alternative heating source for pressureless sintering of commercially pure Ti powders, aiming to intensify the sintering process. The effects of the process parameters on the properties of the sintered material are systematically studied. The initial powder compact density is the most influential pa...
Zollinger, J. Rouat, B. Guyon, J. Pillai, S. K. Rappaz, M.
Published in
Metallurgical and Materials Transactions A
Based on detailed EBSD analyses, Kurtuldu et al. (Acta Mater. 70:240–248, 2014) have explained the grain refinement of Au-12.5 wt pctCu-12.5 wt pctAg (yellow gold) by the addition of minute amounts of Ir in terms of “icosahedral quasicrystal (iQC)-mediated nucleation”, i.e., Ir induced the formation of Icosahedral short range order (ISRO) of atoms ...
