Results 261 to 270 of about 25,614 (293)

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

A model for coherency strengthening of large precipitates

Scripta Materialia, 2014
In precipitation strengthening, the lattice misfit between precipitate and matrix produces a strain field around precipitates, which impedes dislocation movement. In this paper, a strengthening model is presented, which delivers the stress increment associated with the strain field around large homogeneous spherical precipitates.
M.R. Ahmadi, E. Povoden-Karadeniz, B. Sonderegger, K.I. Öksüz, A. Falahati, E. Kozeschnik   +5 more
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

Strengthening Mechanisms in γ′ Precipitating Alloys

Metal Science Journal, 1970
The mechanical properties of several austenitic steels containing γ′ precipitate have been studied.
D. Raynor, J. M. Silcock
openaire   +1 more source

Origin of strengthening on precipitation: Ordered particles

Acta Metallurgica, 1957
Abstract An analysis is given to show that the presence of order in precipitate particles can give rise to considerable strengthening even in the absence of strains. Some of the implications of this are given and systems which might owe their strength to this mechanism are discussed.
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

Precipitation strengthening in Mg-Sn alloys with multiple precipitate types

Philosophical Magazine, 2022
Yang Lyu, Ian P. Jones, Yu-Lung Chiu
openaire   +1 more source

Modeling quenching of precipitation strengthened alloys

Products of precipitation strengthened alloys characteristically lose their ability to develop peak properties as the rate of the quench from the solution temperature is reduced. An analytical model was developed which improved on a previous model to predict mechanical properties of such materials from time-temperature-property, TTP, C-curves and a ...
James Thomas Staley, Roger D. Doherty
openaire   +1 more source