...Anup Kulkarni; Vivek C. Peddiraju; Subhradeep Chatterjee; Dheepa Srinivasan The current work presents an understanding of microstructure and mechanical properties as a function of build geometry and build orientation in Cu-Cr-Zr via the laser powder bed fusion (LPBF) technique. Porosity...

...Tawqeer Nasir Tak; Aditya Prakash; Arijit Lodh; Shyam M. Keralavarma; S. V. S. Narayana Murty; Indradev Samajdar; P. J. Guruprasad In this paper, the effect of porosity on the ductility of as-cast AA7075 (a commercial high-strength aluminum alloy) was investigated. The as-cast material...

... with the basic principle of crater growth coupled with the synergistic influences of mechanical and chemical effects, the law governing the presence and growth of corrosion pits was studied. Based on the concept of microscopic damage mechanics, porosity as a damage variable was introduced and the resulting model...

... representative volume elements generated by both X-ray tomography and a virtual technique. The response of the material to a multi-axial state of stress/strain for porosities as large as 0.3 is explored, obtaining the yield surfaces and their evolution as well as scaling laws for both elastic and plastic...

... and sieved sawdust mixed at distinct volume fractions. The variation of the porosity and density of the PCCW was studied with respect to the amounts of sawdust and clay used in the manufacturing. The research helped to clearly define the roles of clay and sawdust quantities for strength development in both T...

... also from the level of their porosity. Recent trends that focus on the improvement in poor strength properties of HA coatings include the introduction of solid solution of Y 2 O 3 in ZrO 2 ( Khalil et al., 2007, “Consolidation and Mechanical Properties of Nanostructured Hydroxyapatite Bioceramics...

...S. M. Lee; H. H. Kim; C. G. Kang Mechanical properties and microstructure of heat-treated samples of A356 and AA2024 aluminum alloys, which were rheoforged by varying the change in pressure and temperature were investigated, preventing defects such as porosity, liquid segregation, and insufficient...

...Hamed Khatam; Linfeng Chen; Marek-Jerzy Pindera The effects of porosity architecture and volume fraction on the homogenized elastic moduli and elastic-plastic response of perforated thin metal sheets are investigated under three fundamental loading modes using an efficient homogenization theory...

.... An in situ tensile test with X-ray tomography is utilized to quantify material damage during deformation in terms of the number of nucleated voids and porosity. The results of this experiment are used for both the development of a clustering-sensitive nucleation criterion and the validation of the damage...

...W. Gan; K. Okamoto; S. Hirano; K. Chung; C. Kim; R. H. Wagoner Friction-stir welding (FSW) promises joints with low porosity, fine microstructures, minimum phase transformation, and low oxidation compared with conventional welding techniques. It is capable of joining combinations of alloys...

... distribution, good reinforcement-matrix interfacial integrity, significant grain refinement of magnesium matrix with increasing presence of reinforcement, and the presence of minimal porosity. Mechanical properties characterization revealed that the presence of nano- Y 2 O 3 reinforcement leads to marginal...

... by hot extrusion. The results show that the monolithic and the reinforced magnesium materials have minimal porosity and the reinforced magnesium materials have fairly well distributed nanosized SiC and Si C + Al 2 O 3 particles in the matrix. The thermo-mechanical property measured in terms...

... observed as functionally graded in both composition and porosity. 19 09 2005 27 02 2006 nickel alloys titanium alloys titanium compounds composite materials functionally graded materials combustion synthesis elasticity shape memory effects hardness wear corrosion resistance X...

...Ken Gall; Yiping Liu; Dmitri Routkevitch; Dudley S. Finch We examine the mechanical behavior of anodic alumina thin films with organized nanometer-scale porosity. The cylindrical pores in the alumina film are arranged perpendicular to the film thickness in a near-perfect triangular lattice...

...Stuart Barnes; Michael J. Nash; Y. K. Kwok A 1200 W diode laser was used to modify the surface properties of a fully-sintered ferrous PM material. Two modifications were investigated; transformation hardening of selected areas and sealing of surface porosity by re-melting. The diode laser was used...

... internal stresses density digital simulation modelling viscoplasticity cold working yield stress porous materials porosity Powder metallurgy is the process by which engineering products are manufactured from materials in powder form. For hardmetal this process involves the two steps...

... phenomena thermal barrier coatings austenitic stainless steel plasma arc sprayed coatings porosity crack-edge stress field analysis ultrasonic materials testing crack detection voids (solid) microcracks scanning electron microscopy For fossil fuel fired power generation, higher thermal...