On the creep behavior of dual-scale particle strengthened nickel based alloy

Abstract

A novel dual-scale particle strengthenedNi-20Crbased alloy was developed with addition of 1.2 wt.% nano-Y 2 O 3 and 5 wt.% sub-micron Al 2 O 3 via mechanical alloying.The Ni-20Cr-1.2Y 2 O 3-5Al 2 O 3 alloy exhibited significant reduction in the minimum creep rate (in the order of 10-9 s-1) at 800 o C and 100 MPa.

Relaxation path of nanoparticles in an oxygen-enriched ferritic oxide-dispersion-strengthened alloy

“…Successive impacts between milling balls and powder result in the formation of a large amount of point defects together with the fragmentation, amorphization and dissolution of the alloyed components (Y 2 O 3 and TiH 2 ) [6][7][8][9][10]. MA is therefore an out of equilibrium process and is known to form solid solutions of immiscible materials [11][12][13][14]. Numerous milling parameters are involved in mechanical alloying as the milling atmosphere, time and intensity, the mill type or different type of contaminations (powder or gas purity, milling balls, powder transfers).…”

“…Both particles seem to have a b.c.c. structure observed along the same [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] zone axis. The interplanar distances do not match the Y 2 O 3 phase or any other type of known Y-Ti oxide structures, Fig.…”