In order to form model aluminide coatings for studying critical issues related to their high temperature oxidation and corrosion performance, a laboratory chemical vapor deposition (CVD) procedure is being used to more rigorously control the coating process in terms of composition, purity and microstructure. One ferritic (Fe-9Cr1Mo) and one austenitic alloy (304L) were selected as substrate mat...

The three dimensional (3D) microstructural evolution of A206 (AlCu4.5Mg0.3) and AlCu7 alloys is studied as function of solution treatment (ST) time by synchrotron tomography. 3D microstructural parameters of rigid phases such as volume fraction, interconnectivity (volume of biggest aluminide/total aluminide volume) and contiguity (touching surface) are presented. In situ synchrotron tomography ...

The fracture toughness of an industry benchmark platinum-modified nickel aluminide coating (RT22LT) is determined by microcantilever bending tests. Cantilevers are prepared in three microstructurally-different zones across the cross-section focused ion beam machining and then bent in-situ a nanoindenter scanning electron microscope. Elastic-plastic mechanics, combined with finite element analys...

A 0.5 μm thick layer of rhodium was deposited on the CMSX 4 superalloy by the electroplating method. The rhodium-coated superalloy was hafnized and aluminized or only aluminized using the Chemical vapour deposition method. A comparison was made of the microstructure, phase composition, and oxidation resistance of three aluminide coatings: nonmodified (a), rhodium-modified (b), and rhodiumand ha...

In the present article doping of aluminide coatings by Pt/Pd as well Hf or Pd using industrial processes was developed. The different combinations elements were tested their influence on chemical composition initially investigated. Pt and both + electroplated surface MAR M247 nickel superalloy. Zr doped during low activity CVD aluminizing process Bernex BPX Pro 325S system. conducted research s...

In order to determine the potential benefits and limitations of aluminide coatings, coatings made by chemical vapor deposition (CVD) on Feand Ni-base alloy substrates are being evaluated in various hightemperature environments. Testing of coatings on representative ferritic (Fe-9Cr-1Mo) and austenitic (type 304L stainless steel) alloys has found that high frequency thermal cycling (1h cycle tim...

One of the critical issues for the application of iron aluminide coatings is the loss of Al from the coating into the Fe-base substrate alloys which do not contain aluminum. The interdiffusion behavior between chemical vapor deposited (CVD) aluminide coatings and ferritic and austenitic substrates is being studied for times up to 10,000h in the temperature range of 500-800oC. Coatings were synt...

recent studies demonstrate that aluminide coatings are beneficial to wear and erosion resistance and also that oxygen-active elements such as yttrium can remarkably improve this resistance. in this research, the micro-hardness of the aluminide coatings with and without yttrium on 1045 steel was investigated using a micro-mechanical probe. wear of the samples was measured using a pin-on-disk tri...