Results 251 to 260 of about 1,050,906 (291)

Precipitation strengthening of binary AlLi alloys by δ′ precipitates

Materials Science and Engineering: A, 1988
Abstract The published data on the strengthening of binary AlLi alloys by δ′ precipitates are analyzed according to a recent version of the theory of order strengthening. The results are found to agree with the data provided that the antiphase boundary energy γapb on {111} is assigned a value in the range 0.140–0.160 J m−2.
J.C. Huang, A.J. Ardell
openaire   +1 more source

Effect of Deformation on Precipitation-Strengthening

Metal Science, 1974
AbstractThe effect of deformation after quenching but before ageing on the age-hardening of several aluminium alloys has been investigated. The changes in hardness, tensile properties, and microstructure during ageing have been recorded. It has been found that, in addition to the work-hardening effect, alloys exhibiting heterogeneous nucleation display
openaire   +1 more source

Strengthening of Ferrite by Vanadium Carbide Precipitation

Metal Science Journal, 1973
AbstractWhen iron–vanadium–carbon alloys are transformed from the γ to the α state, a banded dispersion of vanadium carbide is formed as the transformation fronts move through the crystals. The strengthening resulting from this reaction in a series of alloys isothermally transformed in the range 725–850° C is shown to be dependent on the transformation
A. D. Batte, R. W. K. Honeycombe
openaire   +1 more source

Synergistic precipitation strengthening in TiAl alloys

Applied Physics Letters, 2006
Precipitation of creep-life enhancing H carbides and ζ silicides occurring during α2 dissolution in fully lamellar (α2+γ)-TiAl (alloyed with carbon and silicon) were studied by transmission electron microscopy. The α2→(γ+precipitate) transformation reaction consisted of the following sequence: α2 dissolution by ledge mechanism, silicide precipitation ...
M. Karadge, Y.-W. Kim, P. I. Gouma
openaire   +1 more source

Strengthening of Sapphire by Precipitates Containing Titanium

Journal of the American Ceramic Society, 1967
Sapphire single crystals alloyed with 0.5 cation % Ti and aged at 1500° C to form a precipitate showed considerable increase in hardness and fracture strength over unalloyed sapphire. It is suggested that propagation of a crack requires local plastic deformation and that precipitate particles interfere with local plastic deformation.
S. E. HSU, W. KOBES, M. E. FINE
openaire   +1 more source

DISPERSION-STRENGTHENED IRON BY GEL PRECIPITATION

Powder Metallurgy, 1973
Metastable iron oxide particles containing calcium, magnesium, or zirconium in solid solution were produced by the gel precipitation method. These were reduced to metal with hydrogen/nitrogen mixtures in a fluidized-bed furnace at 800°C to yield iron powders containing dispersed oxide phases within each iron particle.
M. R. James, J. R. Moon
openaire   +1 more source

Phase chemistries in a precipitation-strengthened superalloy

Proceedings, annual meeting, Electron Microscopy Society of America, 1983
The majority of Ni-base superalloys are strengthened by precipitation of the γ' phase, which has a coherent ordered Ll2 structure based on Ni3(Al,Ti). However, a few superalloys, most notably Inconel 718, are strengthened instead by a γ" phase, which is a metastable coherent ordered DO22 precipitate with a tetragonal unit cell and nominal stoichiometry
E. L. Hall, Y. M. Kouh, K. M. Chang
openaire   +1 more source

Strengthening of titanium steels by carbide precipitation

Metal Science, 1977
AbstractThree simple high-purity steels containing between 0.10 and 0.55 wt.-% titanium and 0.02–0.11% carbon have been examined after direct transformation of austenite to ferrite by subcritical isothermal transformation in the range 600–800°C and by continuous cooling.
S. Freeman, R. W. K. Honeycombe
openaire   +1 more source

Precipitation strengthening of the aluminum alloy AA6111

Metallurgical and Materials Transactions A, 2003
There is an increasing use of aluminum alloy sheet in automotive applications due to the desire to decrease vehicle weight. The current study provides a detailed quantitative study on precipitation strengthening in AA6111, which is the alloy of choice in North America for exposed body panels.
X. Wang, J. D. Embury, W. J. Poole, S. Esmaeili, D. J. Lloyd   +4 more
openaire   +1 more source

Microstructure of precipitation strengthened Ni3Al and TiAl

Materials Science and Engineering: A, 1992
Abstract Structural studies have been performed on precipitation hardening found in Ni3Al- and TiAl-based ordered alloys using transmission electron microscopy. In an L12-ordered Ni3Al alloy with appropriate titanium content, fine precipitates of coherent disordered γ are formed during aging.
M Nemoto, W.H Tian, K Harada, C.S Han, T Sano   +4 more
openaire   +1 more source