Role of second-phase particles in the microstructural evolution and mechanical properties of extruded Mg-Gd-Y-Ag-Zr alloys

The pipeline steel as an application in pipeline construction must have good comprehensive mechanical properties due to the harsh environment of the pipeline engineering. So this experiment takes the X80 pipeline steel as the research object, the thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding nanomagnesium oxide into the steel with the method of carrier dispersion addition. The effect of nanometer magnesium oxide addition on the cast microstructure of X80 pipeline steel was analysed. The results show that the cast microstructure is consist of the ferrite and a small amount bainite. And the bainite is distributed at the boundary of the ferrite grains. When adding 0.02 wt% nanometer magnesium oxides, the number of bainite increases significantly in the cast microstructure, which is mostly distributed at the boundary of the ferrite grains.

Download Full-text

Study on the Role of Second Phase Particles in Hydrogen Uptake Behavior of Zirconium Alloys

Zirconium in the Nuclear Industry: 16th International Symposium ◽

10.1520/stp49271t ◽

2011 ◽

pp. 466-495 ◽

Cited By ~ 2

Author(s):

M. Y. Yao ◽

J. H. Wang ◽

J. C. Peng ◽

B. X. Zhou ◽

Q. Li

Keyword(s):

Zirconium Alloys ◽

Hydrogen Uptake ◽

Second Phase ◽

Second Phase Particles

Download Full-text

Role of Second-Phase Particles on In Situ Deformation of an AZ80 Mg Alloy

Applications of Microscopy in Materials and Life Sciences - Springer Proceedings in Materials ◽

10.1007/978-981-16-2982-2_6 ◽

2021 ◽

pp. 55-64

Author(s):

R. Sarvesha ◽

W. Alam ◽

J. Jain ◽

S. S. Singh

Keyword(s):

Mg Alloy ◽

Second Phase ◽

Second Phase Particles ◽

In Situ Deformation

Download Full-text

Alloying and Processing Effects on the Microstructure, Mechanical Properties, and Degradation Behavior of Extruded Magnesium Alloys Containing Calcium, Cerium, or Silver

Materials ◽

10.3390/ma13020391 ◽

2020 ◽

Vol 13 (2) ◽

pp. 391 ◽

Cited By ~ 6

Author(s):

Jan Bohlen ◽

Sebastian Meyer ◽

Björn Wiese ◽

Bérengère J. C. Luthringer-Feyerabend ◽

Regine Willumeit-Römer ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Processing Parameters ◽

Second Phase ◽

Degradation Behavior ◽

Microstructure Development ◽

Corrosion Properties ◽

Second Phase Particles ◽

Degradation Rates ◽

The Relationship

Magnesium alloys attract attention as degradable implant materials due to their adjustable corrosion properties and biocompatibility. In the last few decades, especially wrought magnesium alloys with enhanced mechanical properties have been developed, with the main aim of increasing ductility and formability. Alloying and processing studies allowed demonstrating the relationship between the processing and the microstructure development for many new magnesium alloys. Based on this experience, magnesium alloy compositions need adjustment to elements improving mechanical properties while being suitable for biomaterial applications. In this work, magnesium alloys from two Mg-Zn series with Ce (ZE) or Ca (ZX) as additional elements and a series of alloys with Ag and Ca (QX) as alloying elements are suggested. The microstructure development was studied after the extrusion of round bars with varied processing parameters and was related to the mechanical properties and the degradation behavior of the alloys. Grain refinement and texture weakening mechanisms could be improved based on the alloy composition for enhancing the mechanical properties. Degradation rates largely depended on the nature of second phase particles rather than on the grain size, but remained suitable for biological applications. Furthermore, all alloy compositions exhibited promising cytocompatibility.

Download Full-text

Wear Properties of Y-TZP Ceramics Dispersed with Second Phase Particles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.744 ◽

2008 ◽

Vol 368-372 ◽

pp. 744-747

Author(s):

Xiao Ping Liang ◽

Shao Bo Xin ◽

Xiao Hui Wang ◽

Zheng Fang Yang

Keyword(s):

Mechanical Properties ◽

Wear Resistance ◽

Mass Fraction ◽

Normal Load ◽

Roller Bearing ◽

Second Phase ◽

Wear Properties ◽

Wear Rates ◽

Second Phase Particles ◽

Better Than

The wear properties of ADZ (alumina dispersed in Y-TZP) and MDZ (mullite dispersed in Y-TZP) were investigated by using a ring-on-block tribometer. The results showed that for Y-TZP ceramic, the addition of alumina phase (with 10-20% in mass fraction) leads to an improved wear resistance. With the increase of the normal load, the wear rates of ADZ ceramics increase. Under low and medium normal load (100N and 300N), the wear resistance is controlled by the hardness of ceramics, and under high normal load (500N) the fracture toughness is obviously contributed to the wear resistance of the ceramics. For MDZ ceramic, the wear resistance of 15MDZ (15wt% mullite dispersed in Y-TZP) is better than that of 20 MDZ (20wt% mullite) under the normal load from 100 N to 500 N. The mechanical properties of 15MDZ are worse than that of Y-TZP ceramic, but the wear resistance is enhanced due to the action of “needle roller bearing” of the fractured rod-like mullite particles.

Download Full-text

Effect of Nb Addition on the Structural and Mechanical Properties of Cu46Zr42Al7Y5 Bulk Metallic Glass

Materials Science Forum ◽

10.4028/www.scientific.net/msf.675-677.201 ◽

2011 ◽

Vol 675-677 ◽

pp. 201-204

Author(s):

Y.L. Du ◽

H.W. Xu ◽

J.L. Cheng ◽

Guang Chen

Keyword(s):

Mechanical Properties ◽

Amorphous State ◽

Differential Scanning Calorimetric ◽

Second Phase ◽

Glass Forming ◽

Copper Mold Casting ◽

Mold Casting ◽

Second Phase Particles ◽

Nb Content ◽

Nb Addition

In this work, the Cu46Zr42-xAl7Y5Nbx alloys with different Nb contents were prepared by water-cooled copper mold casting. The effects of Nb addition on the structural and mechanical properties were studied. It was found that the structure remains in amorphous state at low Nb concentration (x =1, 2). However, some crystalline phases appear in the high Nb content alloy (x > 2), showing a composite structure, that is, the second phase particles dispersed in an amorphous matrix. The effects of Nb on the glass-forming ability of Cu46Zr42Al7Y5 were studied by differential scanning calorimetric (DSC). The compressive mechanical properties of Cu46Zr42-xAl7Y5Nbx alloys were studied. It was found that the compressive strength can be improved by introducing Nb. However, the ductile of the alloys were not improved by the introduction of Nb.

Download Full-text