scholarly journals Mechanical Behavior of Powder Metallurgy SUS304 Consolidated by Hot Extrusion at Elevated Temperatures.

1995 ◽  
Vol 42 (5) ◽  
pp. 618-622 ◽  
Author(s):  
Tatsuro Isomoto ◽  
Hiroshi Nagai
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Behavior ◽  
Elevated Temperatures ◽  
Hot Extrusion

Microstructures, Mechanical and Creep Properties of Rapidly Solidification/Powder Metallurgy Mg-6wt.%Zn Alloys with 5wt.%Ce and 1.5wt.%Ca Additions

2016 ◽  
Vol 861 ◽  
pp. 253-263
Author(s):  
Tao Zhou ◽  
Deng Hui Song ◽  
Zhen Hua Chen
Keyword(s):  
Compressive Strength ◽  
Powder Metallurgy ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Hot Extrusion ◽  
Creep Properties ◽  
High Compressive Strength ◽  
Rapidly Solidification ◽  
Twin Roll ◽  
Thermal Stability Of

Rapidly solidification/powder metallurgy (RS/PM) Mg-6Zn, Mg-6Zn-5Ce and Mg-6Zn-5Ce-1.5Ca (wt.%) alloys were produced via hot extrusion with RS powders, produced by atomization-twin roll quenching. Microstructures, mechanical and creep properties of the alloys were investigated. The results showed that for the Mg-6Zn alloys with 5wt.%Ce and 1.5wt.%Ca additions, the microstructures of the alloys were gradually refined, which caused the strength of the alloy at room temperature to increase remarkably, especially for the RS/PM Mg-6Zn-5Ce-1.5Ca alloy, exhibited a high compressive strength of 394MPa at room temperature. At elevated temperatures, due to the fine and stable intermetallic compounds i.e. MgxZnyCez and MgxZnyCez-(Ca) phases were formed for the Mg-6Zn-5Ce alloy and Mg-6Zn-5Ce-1.5Ca alloys, respectively, and the thermal stability of the ternary phase was a little lower than that of the quaternary phase because of the dissolving of Ca into the MgxZnyCez phase, the mechanical and creep properties at elevated temperatures increased remarkably with Ce and Ca additions, especially for the RS/PM Mg-6Zn-5Ce-1.5Ca alloy, which exhibited a high compressive strength of 258MPa at 200°C, and the minimum creep rate was decreased about 2 times, compared with that of the Mg-6Zn-5Ce alloy.

Mechanical Behavior of Molybdenum-Modified Cr3Si/Cr5Si3 Intermetallics

1996 ◽  
Vol 460 ◽  
Author(s):  
M. Nazmy ◽  
C. Noseda ◽  
S. Augustin ◽  
P. Lipetzky ◽  
N. S. Stoloff
Keyword(s):  
Fracture Toughness ◽  
Thermal Expansion ◽  
Powder Metallurgy ◽  
Flexural Strength ◽  
Mechanical Behavior ◽  
Interfacial Reaction ◽  
Elevated Temperatures ◽  
Base Material ◽  
Different Temperatures ◽  
Limited Diffusion

ABSTRACTTwo molybdenum-modified chromium suicide base intermetallics have been prepared by powder metallurgy and investigated with respect to the hardness, flexural strength and fracture toughness at different temperatures. As toughening phase, tungsten, Pt-6%Rh and Saphikon fibres were tried to improve the toughness of these two intermetallics. The tungsten fibers generated microcracks in the base material due to the large mismatch in the coefficients of thermal expansion (CTE) between the fiber and the intermetallic. The Pt-6%Rh and Saphikon fibers did not exhibit such cracking.An improvement in the fracture toughness was observed especially at elevated temperatures. The Saphikon fibers did not show interfacial reaction. Some limited diffusion of silicon was detected in the Pt-6%Rh phase after 1400°C treatment.

UNS T20819

Alloy Digest ◽  
1989 ◽  
Vol 38 (2) ◽  
Keyword(s):  
Elevated Temperatures ◽  
Hot Extrusion ◽  
Heat Treating ◽  
High Toughness ◽  
Extrusion Dies ◽  
Extrusion Die ◽  
Steel Mills ◽  
Temperature Performance ◽  
Heat Checking ◽  
Resistance To Heat

Abstract UNS T20819 is a hot-work tool and die steel that is characterized by excellent resistance to shock and abrasion at elevated temperatures. This steel provides relatively high toughness and outstanding resistance to heat checking and softening at elevated temperatures. Among its many applications are hot-punch tools, forging dies and inserts, brass extrusion dies, permanent molds for brass casting and hot-extrusion die inserts for steel. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-496. Producer or source: Tool steel mills.

Microstructure and Mechanical Properties of Ti-6Al-4V Manufactured by SLM

2015 ◽  
Vol 651-653 ◽  
pp. 677-682 ◽  
Author(s):  
Anatoliy Popovich ◽  
Vadim Sufiiarov ◽  
Evgenii Borisov ◽  
Igor Polozov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Behavior ◽  
Ductile Fracture ◽  
Elevated Temperatures ◽  
Initial Material ◽  
Laser Melting ◽  
Microstructure And Mechanical Properties ◽  
Before And After

The article presents results of a study of phase composition and microstructure of initial material and samples obtained by selective laser melting of titanium-based alloy, as well as samples after heat treatment. The effect of heat treatment on microstructure and mechanical properties of specimens was shown. It was studied mechanical behavior of manufactured specimens before and after heat treatment at room and elevated temperatures as well. The heat treatment allows obtaining sufficient mechanical properties of material at room and elevated temperatures such as increase in ductility of material. The fractography of samples showed that they feature ductile fracture with brittle elements.

MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF AMORPHOUS Al–Cu–Ti METAL FOAMS SYNTHESIZED BY SPARK PLASMA SINTERING

2017 ◽  
Vol 24 (Supp02) ◽  
pp. 1850022
Author(s):  
MAOYUAN LI ◽  
LIN LU ◽  
ZHEN DAI ◽  
YIQIANG HONG ◽  
WEIWEI CHEN ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Intermetallic Compounds ◽  
Spark Plasma Sintering ◽  
Elevated Temperatures ◽  
Volume Fraction ◽  
Metal Foams ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Xrd Patterns

Amorphous Al–Cu–Ti metal foams were prepared by spark plasma sintering (SPS) process with the diameter of 10[Formula: see text]mm. The SPS process was conducted at the pressure of 200 and 300[Formula: see text]MPa with the temperature of 653–723[Formula: see text]K, respectively. NaCl was used as the space-holder, forming almost separated pores with the porosity of 65 vol%. The microstructure and mechanical behavior of the amorphous Al–Cu–Ti metal foams were systematically investigated. The results show that the crystallinity increased at elevated temperatures. The effect of pressure and holding time on the crystallization was almost negligible. The intermetallic compounds, i.e. Al–Ti, Al–Cu and Al–Cu–Ti were identified from X-ray diffraction (XRD) patterns. It was found that weak adhesion and brittle intermetallic compounds reduced the mechanical properties, while lower volume fraction and smaller size of NaCl powders improved the mechanical properties.

Mechanical behavior of SiC at elevated temperatures

1985 ◽  
Vol 71 ◽  
pp. 209
Author(s):  
E.R. Fuller ◽  
S.M. Wiederhorn ◽  
N.J. Tighe ◽  
L. Chuck
Keyword(s):  
Mechanical Behavior ◽  
Elevated Temperatures
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