Showing papers in "Scripta Materialia in 1999"

TL;DR: In this article, the authors reported the first results using friction stir processing (FSP) for aluminum alloys and showed that FSP of a commercial 7075 Al alloy resulted in significant enhancement of superplastic properties.

TL;DR: In this article, the authors present an instrumented indentation method that provides a continuous record of the variation of indentation load, P, as a function of the depth of penetration, h, into the indented specimen.

TL;DR: In this paper, the authors investigated whether or not it is possible to produce the bulk steel sheets with ultra-fine grains by the cumulative roll bonding (ARB) process, and the results showed that it is not possible.

TL;DR: In this article, an analysis of previous data concerning the compositional dependence of M{sub s} from the viewpoint of searching for empirical correlation between the electron concentration and stability of {beta}-phase in Ni-Mn-Ga system is presented.

TL;DR: In this article, experimental results on nano-indentation of polycrystalline Cu thin films, of three different thicknesses but with approximately the same grain size and texture, on Si substrates were presented.

TL;DR: In this article, the average residual weld zone grain size has been observed to increase near the top of the weld, and to decrease with distance on either side of the welding-zone centerline, an d this corresponds roughly to temperature variations within the weld zone.

TL;DR: In this paper, hardness measurements, differential scanning calorimetry and transmission electron microscopy have been used to study the precipitation hardening behavior in aluminum alloy 6022, and the results showed that the hardness of 6022 can be improved with a change in composition, processing and aging practices.

TL;DR: In this paper, the authors determined the minimum height of aluminum foam specimens for compression test at a quasi-static strain rate by comparing the specific yield stress (i.e., yield stress per (relative density),sup 3/2}) of the foam with other data previously reported.

TL;DR: In this paper, a novel in situ process in which traditional ingot metallurgy plus SHS techniques were used to produce (TiB + TiC)/Ti matrix composites was presented.

TL;DR: In this article, the role of the metastable intermediate precipitate phase(s) in the nucleation of successive intermediate or equilibrium precipitate phases remains to be established, and the authors report experimental observations of the precipitation sequence in a WE54 alloy during isothermal ageing at 250 C.

TL;DR: In this article, the authors have reported the development of a new thermomechanical process which produces ultrafine ferrite (UFF) in hot rolled steel strip, which is the result of a strain induced transformation reaction activated over a significant volume of the austenite.

TL;DR: In this paper, the fracture behavior of a Zr{sub 41.25}Ti{sub 13.75}Ni{sub 10}Cu{sub 12.5}Be{sub 22.5] bulk metallic glass observed using a single edge notched fracture sample loaded in tension (SEN(T)).

TL;DR: In this article, the authors used the T-c diagram to characterize the chemical ordering transition in Ni{sub 50}Mn{sub x}Ga{ sub 50{minus}x} over a composition range of 15 {le} x {le] 35 by performing in situ neutron diffraction measurements.

TL;DR: In this article, the effect of the Kurdjumov-Sachs orientation relationship on sigma phase formation in a duplex stainless steel weld metal with different chemical compositions was examined.

TL;DR: In this paper, the minimum amount of Cu that would trigger the development of increased levels of microporosity in Sr-modified Al-Cu-Si-Mg alloys was determined.

TL;DR: In this paper, the effect of factors such as prior-beta grain size, strain rate, and temperature on plastic flow and microstructure evolution during hot forging of Ti-6Al-4V with a lamellar colony micro-structure was investigated.

TL;DR: In this paper, a combination of transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP) was used to examine the precise compositions of precipitates in a high-purity, ternary Al-Zn-Mg alloy.

TL;DR: In this paper, the authors report on the compressive deformation behavior and failure mode of near full-density (99.2% of theoretical density) elemental Fe with an average grain size of 80 nm.