Creep behavior of the weldment a new type martensitic heat-resistant steel 12Cr10Co3W2MoNiVNbNB joined with vacuum electron beam welding is studied employing nano-indentation technique at room temperature. Different load-displacement curves are obtained for base metal, heat affected zone (HAZ) and weld metal welded joint. The creep displacement exhibits sharp rise first, then rate continuously ...

Compression creep tests were performed on the ternary 91.84Sn-3.33Ag-4.83Bi (wt.%, abbreviated Sn-Ag-Bi) Pb-free alloy. The test temperatures were: −25 °C, 25 °C, 75 °C, 125 °C, and 160 °C (± 0.5 °C). Four loads were used at the two lowest temperatures and five at the higher temperatures. The specimens were tested in the as-fabricated condition or after having been subjected to one of two air a...

Nanoindentation creep and loading rate change tests were employed to examine the rate sensitivity (m) and hardness of nanocrystalline tetragonal Ta films. Experimental results suggested that the m increased with the decrease of feature scale, such as grain size and indent depth. The magnitude of m is much less than the corresponding grain boundary (GB) sliding deformation with m of 0.5. Hardnes...

The effect of substituting 0.01 at.% Er for Sc in an Al–0.06Zr–0.06Sc–0.04Si (at.%) alloy subjected to a two-stage aging treatment (4 h/300 C and 8 h/425 C) is assessed to determine the viability of dilute Al–Si–Zr–Sc–Er alloys for creep applications. Upon aging, coherent, 2–3 nm radius, L12-ordered, trialuminide precipitates are created, consisting of an Erand Sc-enriched core and a Zr-enriche...

2014 From a phenomenological theory of domain kinetics in a coherent two-phase field it is inferred that the creep rate at the start of macroplastic deformation goes to zero, as the temperature approaches the singular point of the thermal relaxation time. It is pointed out that the erosion of the domains decorating the edge dislocations can be followed through the intensity of the light scatter...

The creep behavior of a binary Mg-15 wt.% Gd alloy was investigated over the temperature range from 523 K to 743 K, i.e., in both single-phase region (the hexagonal close-packed solid solution Mg) and two-phase plus Mg5Gd precipitates). prepared by squeeze casting technique. In higher range, at 723 specimens were treated situ annealing prior testing. At 673 below, tested cast state. interpreted...

The deformation mechanisms of an alumina-forming austenitic stainless-steel Fe–20Cr–30Ni–2Nb–5Al (at. %) were investigated at 750 °C using both creep tests and strain rate jump tests. It was found that nano-sized L12-structured precipitates the dominant precipitate in matrix provided majority strengthening. This behavior could be modeled well a threshold stress term power law equation. Addition...

Over the years, demand for high engine efficiency has resulted in development of new generation superalloys with improved elevated temperature properties, especially creep resistance. This study aimed to evaluate and mechanical behavior Inconel 718 superalloy. Creep tests were performed at range 650 700 °C stress 625 814 MPa. Hot tensile oxidation characterization techniques used this scanning ...

Episodic tremor and slow slip (ETS) downdip of the subduction seismogenic zone are poorly understood behaviors seismic cycle. Talc, a common metasomatic mineral at interface, is suggested to host but this hypothesis has not been tested in rock record. We investigate actinolite microstructures from talc-bearing talc-free rocks exhumed depths modern ETS (Pimu'nga/Santa Catalina Island, California...