Effects of Heat Treatment on the Microstructures and High Temperature Mechanical Properties of Hypereutectic Al–14Si–Cu–Mg Alloy Manufactured by Liquid Phase Sintering Process

2018 ◽  
Vol 24 (3) ◽  
pp. 586-596 ◽  
Author(s):  
Joon-Young Heo ◽  
Jin-Han Gwon ◽  
Jong-Kwan Park ◽  
Kee-Ahn Lee
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Mg Alloy ◽  
Sintering Process ◽  
High Temperature Mechanical Properties

TEM Studies of Grain Boundary Films in Si3N4 Ceramics

1991 ◽  
Vol 49 ◽  
pp. 930-931
Author(s):  
H.-J. Kleebe ◽  
J.S. Vetrano ◽  
J. Bruley ◽  
M. Rühle
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Hot Isostatic Pressing ◽  
Amorphous Film ◽  
Liquid Phase Sintering ◽  
Second Phase ◽  
High Temperature Mechanical Properties ◽  
Triple Points ◽  
Boundary Films

It is expected that silicon nitride based ceramics will be used as high-temperature structural components. Though much progress has been made in both processing techniques and microstructural control, the mechanical properties required have not yet been achieved. It is thought that the high-temperature mechanical properties of Si3N4 are limited largely by the secondary glassy phases present at triple points. These are due to various oxide additives used to promote liquid-phase sintering. Therefore, many attempts have been performed to crystallize these second phase glassy pockets in order to improve high temperature properties. In addition to the glassy or crystallized second phases at triple points a thin amorphous film exists at two-grain junctions. This thin film is found even in silicon nitride formed by hot isostatic pressing (HIPing) without additives. It has been proposed by Clarke that an amorphous film can exist at two-grain junctions with an equilibrium thickness.

The disordering process in an Ll2 ordered alloy

1984 ◽  
Vol 42 ◽  
pp. 486-487
Author(s):  
J. A. Horton ◽  
A. DasGupta ◽  
C. T. Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
Intermetallic Alloys ◽  
Antiphase Boundaries ◽  
High Temperature Mechanical Properties ◽  
Heat Treated ◽  
Ordered Intermetallic

Ordered intermetallic alloys potentially have good high temperature mechanical properties which often are obtained by macroalloying. Since service temperatures may be near the critical ordering temperature, Tc, it is important to understand the disordering processes. The disordering mechanism in an alloy of 52.5 at. % Ni—22.5 Fe—14.5 V—10 Al—0.5 Ti [which can be expressed as (Ni70Fe30)3(V58Al40Ti2)], will be presented here. The aluminum was added to increase Tc from 750 to 975°C and stabilize the Ll2 structure.All specimens were first fully ordered by a heat treatment consisting of 30 min at 1000°C, 1 d at 700°C and 2 d at 600°C which results in a “swirl” pattern of antiphase boundaries (APB) similar to Fig. 1. Specimens were then heat-treated for 24 h at temperatures from 600 to 950°C in 50°C increments and water quenched.

Mechanical Properties Variation with Test Temperature for Liquid Phase Sintered 95W-3.5Ni-1.5Fe Alloys

2007 ◽  
Vol 561-565 ◽  
pp. 647-650 ◽  
Author(s):  
Syed Humail Islam ◽  
M. Tufail ◽  
Xuan Hui Qu
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Yield Strength ◽  
Room Temperature ◽  
Substantial Reduction ◽  
Testing Temperature ◽  
Liquid Phase Sintering ◽  
Transgranular Fracture ◽  
Dual Phase ◽  
High Temperature Mechanical Properties

The high temperature mechanical properties of dual phase heavy metal of 95W-3.5Ni-1.5Fe alloy were investigated in tension. The specimens were prepared by liquid phase sintering. Yield strength decreased and ductility increased as the testing temperature was increased to 300°C, reached a plateau at between 300 and 500°C and then decreased considerably. The fracture modes of alloys when deformed at room temperature were a mixture of intergranular fracture and transgranular cleavage. As the temperature was increased, the percentage of intergranular cleavage increased, although transgranular fracture also remained. At higher temperatures, substantial reduction in ductility and in yield strength was a result of loss of bonding strength between tungsten grains and matrix phase.

scholarly journals High-temperature mechanical properties of cast Al–Si–Cu–Mg alloy by combined additions of cerium and zirconium

2020 ◽  
Vol 7 (2) ◽  
pp. 026532
Author(s):  
William Lemos Bevilaqua ◽  
Antonio Ricardo Stadtlander ◽  
Andre Ronaldo Froehlich ◽  
Guilherme Vieira Braga Lemos ◽  
Afonso Reguly
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Mg Alloy ◽  
High Temperature Mechanical Properties

Influence of Heat Treatment on High-Temperature Mechanical Properties of Ti-5Dy-5Si-Sn Alloys

2006 ◽  
Vol 25 (1-2) ◽  
pp. 67-74 ◽  
Author(s):  
Yu.V. Fartushna, ◽  
A.V. Kotko, ◽  
A.V. Samelyuk, ◽  
Yu.N. Podrezov, ◽  
M.V. Bulanova,
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
High Temperature Mechanical Properties

High Density Ba2AlWO5.5 Ceramic Compacts Produced through Liquid Phase Sintering Route for Temperature Sensores

2008 ◽  
Vol 591-593 ◽  
pp. 448-453 ◽  
Author(s):  
Yogendra Prasad Yadava ◽  
Ricardo Arthur Sanguinetti Ferreira
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Structural Characteristics ◽  
Temperature Sensors ◽  
Liquid Phase Sintering ◽  
Oxide Ceramic ◽  
Sintering Process ◽  
Densification Process ◽  
Ceramic Components ◽  
Petroleum Wells

Structural and functional characteristics of ceramic components highly depend on their microstructure and mechanical properties. In the production of such ceramics sintering plays extremely important role. Recently, we are working on the development and fabrication of temperature sensors for the petroleum wells. In this connection, we have developed a new alumina based ordered complex cubic peroviskite oxide ceramic Ba2AlWO5.5. During our study, we found that Ba2AlWO5.5ceramics compacts could not be densified by normal sintering route. To overcome this hurdle, we have utilized the liquid phase sintering process, using CuO additives. By addition of 1 to 2 wt% CuO, we succeeded to sinter this ceramic in the temperature range 1200 to 14000 C. Sintered Ba2AlWO5.5 ceramics were examined by X-diffraction and scanning electron microscopy to verify the presence of any extra phase due to CuO addition in the Ba2AlWO5.5 matrix. Our studies revealed that CuO addition did not affect the structural characteristics, but considerably modified the densification process, microstrutural characteristics and consequently mechanical properties of the Ba2AlWO5.5 ceramics.

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