The Structure and Properties of Precipitation-Strengthened Composites Produced From a Cast Alloy in the Al–Si–Mg System

2021 ◽  
Author(s):  
Yu. M. Podrezov ◽  
K. O. Gogaev ◽  
V.S. Voropaev ◽  
Ya. I. Yevych ◽  
N. P. Korzhova ◽  
...  
Keyword(s):  
Cast Alloy ◽  
Structure And Properties

Structure and Properties of AlMg3 Alloy with Sc and Zr

2007 ◽  
Vol 539-543 ◽  
pp. 487-492
Author(s):  
Vladivoj Očenášek ◽  
Bohumil Smola ◽  
Ivana Stulíková ◽  
J. Pelcová
Keyword(s):  
Cast Alloy ◽  
Age Hardening ◽  
Structure And Properties ◽  
Type Alloy ◽  
Present Contribution ◽  
Weight Concentration ◽  
Phase Development ◽  
Transmission Electron ◽  
Mechanical And Physical Properties ◽  
Effect Phase

The present contribution deals with the effect of thermal and mechanical treatment on structure, mechanical and physical properties of as cast, cold and hot worked AlMg3 type alloy produced by conventional casting, as well as by powder metallurgy. The properties of the AlMg3 alloys with additions of Sc and Zr in the weight concentration ranges 0.14 – 0.29% and 0.05 – 0.12% respectively were studied and compared with those of the alloys without Sc and Zr additions. The anti-recrystallization effect, phase development and mechanical properties investigated in the course of isothermal as well as isochronal annealing were studied by using optical and transmission electron microscopy, electrical resistometry and hardness measurements. The parameters of technological procedure of optimum age hardening by the Al3(ScxZr1-x) phase are presented. This optimum can not be reached if the as cast alloy is exposed to temperatures higher than 350°C. Even the small additions of Sc such as 0.15 wt. % ensure the anti-recrystallization effect of Al3(ScxZr1-x) phase.

Effects of Si on Structure and Properties of Mg-Sn Alloy

2013 ◽  
Vol 320 ◽  
pp. 303-307 ◽  
Author(s):  
Hao Ran Geng ◽  
Peng Liu ◽  
Hua Wei Jiang ◽  
Bo Teng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Testing ◽  
Chinese Character ◽  
Cast Alloy ◽  
Grain Refining ◽  
Structure And Properties ◽  
And Performance ◽  
Si Content ◽  
Si Addition

Magnesium alloys are becoming ever more prevalent in automotive and aerospace industries as energy conservation and performance demands increase. However, it is limited on further application in the automotive field for its low strength compared with steel and aluminum alloys. Effects of Si addition on microstructure and mechanical properties of as-cast Mg-5%Sn magnesium alloy were also studied using SEM, XRD and tensile testing. The results show that the phases of as-cast alloy are composed of α-Mg, Mg2Sn; Mg2Si. The addition of Si suppresses the precipitation of the Mg2Sn, Product Chinese character shape phases of Mg2Si. With the increase of Si content, the effect becomes more apparent. When Si content is up to 1.25wt%, the grain refining effect reached best level. The average alloy grain size reduced from 90μm to 30μm, the tensile strength is the highest. The average tensile strength increased from 128 MPa to 156 MPa. When the Si added at 1.25wt% or less, the hardness and strength were improved with the increase of Si. When 1.25% Si was added, grain did not become further refinement. While Si content was continue to be increase, the tensile strength decreased.

scholarly journals Analysis of the microstructure of wear resistant chrome cast irons after heat treatment

2021 ◽  
pp. 142-148
Author(s):  
A. A. Jumaev ◽  
K. E. Baranovsky ◽  
Yu. N. Mansurov
Keyword(s):  
Heat Treatment ◽  
Chromium Content ◽  
Cast Alloy ◽  
Structure And Properties ◽  
Cast Irons ◽  
Mining Operations ◽  
Wear Resistant ◽  
Operational Characteristics ◽  
Metallurgical Combine ◽  
Machine Parts

At the Navoi Mining and Metallurgical Combine, which uses a large number of machine parts for mining operations, the issue of optimizing the compositions of wear-resistant chromium cast irons while maintaining their operational characteristics has arisen. The paper presents the results of studying the phase composition of the cast alloy, as well as the effect of heat treatment of cast iron with a high chromium content on its structure and properties. As heat treatment operations, quenching in various modes and low tempering were used. The study made it possible to systematize the known literature data on the heat treatment parameters of a group of wear-resistant chromium cast irons, as well as to optimize their heat treatment modes for parts operating in mining and processing industry.

Influence of Molybdenum and Rhenium Dopants on the Structure and Properties of NiAl–Cr–Co Cast Alloy

2021 ◽  
Vol 62 (6) ◽  
pp. 740-755
Author(s):  
V. V. Sanin ◽  
M. I. Aheiev ◽  
Yu. Yu. Kaplanskii ◽  
M. I. Petrzhik
Keyword(s):  
Cast Alloy ◽  
Structure And Properties

Effect of hot isostatic pressing technology on structure and properties of products made of VZh159 heat-temperature alloy

2021 ◽  
pp. 44-48
Author(s):  
A.A. Khlybov ◽  
E.S. Belyaev ◽  
A.D. Ryabtsev ◽  
S.S. Belyaeva ◽  
Yu.A. Getmanovsky ◽  
...  
Keyword(s):  
Fractional Composition ◽  
Cast Alloy ◽  
Hot Isostatic Pressing ◽  
Structure And Properties ◽  
Heat Temperature ◽  
Isostatic Pressing ◽  
Powder Body ◽  
Metallic Inclusions ◽  
Process Documentation ◽  
Pressing Technology

The hot isostatic pressing (HIP) technology is considered on the example of making of compacts made of VZh159 powder. It is shown that powders with fractional composition of –70 +25 µm, bulk density of 3.77 g/cm3 , fl uidity of 2.3 g/s, specifi c surface of 446 cm2 /g, and average Fischer particle size of 16 µm are prone to sorbed gases. Gases on the surface of the powder body as result of the HIP cycle can form non-metallic inclusions that reduce the properties of the compact. To effectively remove gases, vacuum heat treatment is used: degassing. It is established that the structure of HIP-compacts after two- or four-stage ageing has fi ner grain (point 9) compared to the cast alloy (point 7).The mechanical properties of the compacts obtained made of VZh159 power exceed the correspointing requirements of the standard process documentation for ultimate strength by 21...22 % and elongation by 36...45 %.

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Relationships between hierarchical structure and properties in macromolecular systems

1987 ◽  
Vol 45 ◽  
pp. 440-443
Author(s):  
E. Baer
Keyword(s):  
Uniaxial Tension ◽  
Hierarchical Structure ◽  
Inorganic Material ◽  
Hierarchical Structures ◽  
Bone Collagen ◽  
Structure And Properties ◽  
Connective Tissues ◽  
Scale Level ◽  
Fibrous Protein ◽  
Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

The Structure and Properties of MoSi2 Thin Film in Mos Process

1980 ◽  
Vol 38 ◽  
pp. 326-327
Author(s):  
C.K. Wu ◽  
P. Chang ◽  
N. Godinho
Keyword(s):  
Thin Film ◽  
Integrated Circuits ◽  
High Performance ◽  
Large Scale ◽  
Process Development ◽  
Structure And Properties ◽  
Metal Silicides ◽  
High Oxidation ◽  
Important Approach ◽  
High Oxidation Resistance

Recently, the use of refractory metal silicides as low resistivity, high temperature and high oxidation resistance gate materials in large scale integrated circuits (LSI) has become an important approach in advanced MOS process development (1). This research is a systematic study on the structure and properties of molybdenum silicide thin film and its applicability to high performance LSI fabrication.

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