Compressive creep behavior of a cast Al–15Mg2Si in situ composite

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

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Investigation of a Cu-20 mass’ Nb in situ Composite, Part II: Electromagnetic Properties and Application

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.1515/ijmr-1995-860607 ◽

1995 ◽

Vol 86 (6) ◽

pp. 416-422

Author(s):

Dierk Raabe ◽

Frank Heringhaus ◽

Ude Hangen ◽

Günter Gottstein

Keyword(s):

Electromagnetic Properties ◽

Composite Part ◽

In Situ Composite

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Hydrogen-induced amorphization and embrittlement resistance in Ti-based in situ composite with bcc-phase in an amorphous matrix

Journal of Materials Research ◽

10.1557/jmr.2007.0045 ◽

2007 ◽

Vol 22 (2) ◽

pp. 428-436 ◽

Cited By ~ 10

Author(s):

S. Jayalakshmi ◽

J.P. Ahn ◽

K.B. Kim ◽

E. Fleury

Keyword(s):

Hydrogen Embrittlement ◽

Amorphous Alloys ◽

Amorphous Matrix ◽

Mechanical Tests ◽

High Concentration ◽

High Hydrogen ◽

In Situ Composite ◽

Bcc Phase ◽

Embrittlement Resistance

We report the hydrogenation characteristics and mechanical properties of Ti50Zr25Cu25 in situ composite ribbons, composed of β-Ti crystalline phase dispersed in an amorphous matrix. Upon cathodic charging at room temperature, high hydrogen absorption up to ∼60 at.% (H/M = ∼1.2) is obtained. At such a high concentration, hydrogen-induced amorphization occurs. Mechanical tests conducted on the composite with varying hydrogen concentrations indicate that the Ti50Zr25Cu25 alloy is significantly resistant to hydrogen embrittlement when compared to conventional amorphous alloys. A possible mechanism that would contribute toward hydrogen-induced amorphization and hydrogen embrittlement is discussed.

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