Effect of main alloying elements on strength of Al–Si foundry alloys at elevated temperatures

2012 ◽  
Vol 25 (4) ◽  
pp. 215-224 ◽  
Author(s):  
F Stadler ◽  
H Antrekowitsch ◽  
W Fragner ◽  
H Kaufmann ◽  
P J Uggowitzer
Keyword(s):  
Elevated Temperatures ◽  
Alloying Elements ◽  
Foundry Alloys

Effects of alloying elements on mechanical and thermal characteristics of Al-6wt-%Si-0.4wt-%Mg–(Cu) foundry alloys

2019 ◽  
Vol 35 (11) ◽  
pp. 1365-1371
Author(s):  
Se-Weon Choi ◽  
Yu-Mi Kim ◽  
Young-Chan Kim ◽  
Chang-Seog Kang
Keyword(s):  
Thermal Characteristics ◽  
Alloying Elements ◽  
Foundry Alloys

scholarly journals Characterization of Spatter and Sublimation in Alloy 718 during Electron Beam Melting

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5953
Author(s):  
Ahmad Raza ◽  
Eduard Hryha
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Elevated Temperatures ◽  
Ion Beam ◽  
High Vacuum ◽  
Alloying Elements ◽  
Heat Shield ◽  
Alloy 718 ◽  
Feedstock Powder ◽  
Heat Shields

Due to elevated temperatures and high vacuum levels in electron beam melting (EBM), spatter formation and accumulation in the feedstock powder, and sublimation of alloying elements from the base feedstock powder can affect the feedstock powder’s reusability and change the alloy composition of fabricated parts. This study focused on the experimental and thermodynamic analysis of spatter particles generated in EBM, and analyzed sublimating alloying elements from Alloy 718 during EBM. Heat shields obtained after processing Alloy 718 in an Arcam A2X plus machine were analyzed to evaluate the spatters and metal condensate. Comprehensive morphological, microstructural, and chemical analyses were performed using scanning electron microscopy (SEM), focused ion beam (FIB), and energy dispersive spectroscopy (EDS). The morphological analysis showed that the area coverage of heat shields by spatter increased from top (<1%) to bottom (>25%), indicating that the spatter particles had projectile trajectories. Similarly, the metal condensate had a higher thickness of ~50 μm toward the bottom of the heat shield, indicating more significant condensation of metal vapors at the bottom. Microstructural analysis of spatters highlighted that the surfaces of spatter particles sampled from the heat shields were also covered with condensate, and the thickness of the deposited condensate depended on the time of landing of spatter particles on the heat shield during the build. The chemical analysis showed that the spatter particles had 17-fold higher oxygen content than virgin powder used in the build. Analysis of the metalized layer indicated that it was formed by oxidized metal condensate and was significantly enriched with Cr due to its higher vapor pressure under EBM conditions.

scholarly journals On the Sustainable Choice of Alloying Elements for Strength of Aluminum-Based Alloys

2020 ◽  
Vol 12 (3) ◽  
pp. 1059
Author(s):  
Anders E.W. Jarfors ◽  
Andong Du ◽  
Gegan Yu ◽  
Jinchuan Zheng ◽  
Kaikun Wang
Keyword(s):  
Rare Earth ◽  
Aluminum Alloys ◽  
Elevated Temperatures ◽  
Rare Earth Metals ◽  
Current Paper ◽  
Alloying Elements ◽  
Material Strength ◽  
Sustainable Material ◽  
Material Development ◽  
Nickel Copper

Aluminum alloys are today entirely recyclable and are seen as a sustainable material. However, there are limitations in the use of aluminum from material strength and cost perspective. Nickel, copper and rare earth metals are alloying elements that may provide strength at room and elevated temperatures. These are, however, often seen as harmful from a sustainability viewpoint. Additionally, these alloying elements are commonly costly. The current paper makes an analysis of the sustainability–strength dimension of alloying, together with a cost perspective, to guide alloy producers and alloy users in making an educated choice of direction for future materials and material development.

AISI TYPE H22

Alloy Digest ◽  
1994 ◽  
Vol 43 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Physical Properties ◽  
Tool Steel ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Alloying Elements ◽  
Steel Mills ◽  
Temperature Performance ◽  
Aisi Type

Abstract H22 is a tungsten hot work steel with the principal alloying elements of carbon, tungsten, chromium and vanadium. It resists softening at elevated temperatures. This datasheet provides information on composition, physical properties, and elasticity as well as fracture toughness. It also includes information on high temperature performance as well as heat treating and machining. Filing Code: TS-533. Producer or source: Tool steel mills.

Effects of Alloying Elements on Mechanical Properties of Mg-Al Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 845-848 ◽  
Author(s):  
Yeon Jun Chung ◽  
Jung Lae Park ◽  
Nack J. Kim ◽  
Kwang Seon Shin
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Elevated Temperatures ◽  
Casting Machine ◽  
Al Alloys ◽  
Alloying Elements ◽  
Tensile Creep ◽  
Thermally Stable ◽  
Creep Tests ◽  
High Temperature Mechanical Properties

The effects of alloying elements on the microstructure and high temperature mechanical properties of Mg-Al alloys were investigated in this study. In order to improve the high temperature mechanical properties, Sr or Mm was added to the Mg-9Al alloy. The effect of Sn on the Mg-9Al alloy was also examined since Sn was expected to improve the high temperature mechanical properties by forming the thermally stable Mg2Sn phase. The specimens used in this study were produced on a 320 ton cold chamber high-pressure die casting machine. The microstructures of the specimens were examined by optical and scanning electron microscopy and tensile and creep tests were performed at elevated temperatures. Tensile tests were carried out at room temperature, 150oC and 200oC using an initial strain rate of 2×10-4/sec. In addition, tensile creep tests were conducted at the stress levels of 50 MPa and 70 MPa. From the microstructure analyses of the specimens after heat treatment at 400oC for 12 hours, it was found that most of the Mg17Al12 precipitate dissolved into the matrix, while the thermally stable phases continued to exist. The high temperature mechanical properties of the Mg-9Al alloys were found to improve significantly with the additions of Sr, Mm and Sn, due to the formation of the thermally stable precipitates.

The Influence of Ge on the Properties of Mg Alloys

2015 ◽  
Vol 647 ◽  
pp. 72-78 ◽  
Author(s):  
Jan Šerák ◽  
Tomáš Kovalčík ◽  
Dalibor Vojtěch ◽  
Pavel Novák
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Ambient Temperature ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Small Extent ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Combustion Engines ◽  
Thermal Stability Of

Germanium is an element which is used in metallurgy in a very small extent. Much more significant is its use as a semiconductor material. Most of magnesium alloys are usually used for applications at ambient temperature. The significant decrease in mechanical properties is observed already at the temperature higher than 150°C. This is the reason for the effort to prepare a new low-priced magnesium based alloys with improved mechanical properties at elevated temperatures, e.g. for components of combustion engines. Therefore, new unconventional alloying elements are studied for increase the thermal stability of magnesium alloys. The effect of germanium on the microstructure and mechanical properties of Mg-Ge alloys at ambient and elevated temperatures was studied in this paper.

The effect of main alloying elements on the physical properties of Al–Si foundry alloys

2013 ◽  
Vol 560 ◽  
pp. 481-491 ◽  
Author(s):  
F. Stadler ◽  
H. Antrekowitsch ◽  
W. Fragner ◽  
H. Kaufmann ◽  
E.R. Pinatel ◽  
...  
Keyword(s):  
Physical Properties ◽  
Alloying Elements ◽  
Foundry Alloys

Formability of Mg-Zn-Zr Based Alloy Sheets at Elevated Temperatures

2007 ◽  
Vol 345-346 ◽  
pp. 21-24
Author(s):  
Jeong Min Kim ◽  
Bong Koo Park ◽  
Joong Hwan Jun ◽  
Ki Tae Kim ◽  
Woon Jae Jung
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Experimental Results ◽  
Alloying Elements ◽  
Mechanical Process ◽  
Microstructure And Mechanical Properties ◽  
Bend Tests

Mg-3%Zn-0.2%Zr based alloy sheets with various alloying elements additions were fabricated through thermo-mechanical process, and their microstructure and mechanical properties were investigated at room and elevated temperatures. CCV(conical cup value) and V-bend tests were also carried out to evaluate the formability of the fabricated alloy sheets. The experimental results showed that small amounts of Sn or Sr additions could improve the elongation at elevated temperatures, even though the room temperature tensile properties were slightly deteriorated by the Sr addition.

Coatings for TiAl

MRS Bulletin ◽  
1994 ◽  
Vol 19 (10) ◽  
pp. 31-34 ◽  
Author(s):  
Shigeji Taniguchi
Keyword(s):  
Mechanical Properties ◽  
Oxidation Resistance ◽  
Aluminum Content ◽  
Elevated Temperatures ◽  
Surface Coatings ◽  
Alloying Elements ◽  
High Aluminum Content ◽  
Automobile Engines ◽  
Compound Tial ◽  
High Aluminum

The intermetallic compound, TiAl, and materials based on it have been receiving considerable attention because of their high specific strengths at elevated temperatures. Their mechanical properties are being extensively studied, with a view to application in aircraft or automobile engines. Before using these materials at elevated temperatures, their interactions with the environment should be investigated and suitable measures taken to overcome any degradation. It has, however, been reported that protective Al2O3 scales do not form when TiAl is exposed to an oxidizing atmosphere in spite of its high aluminum content. The formation of an A12O3 scale, or at least a scale containing a continuous A12O3 layer, is a prerequisite for providing sufficient protection. Therefore, much effort has been expended in choosing suitable alloying additions. However, relatively less effort has been devoted to surface coatings on such materials. The purpose of the alloying addition is two-fold: to improve mechanical properties, particularly ductility, and to improve oxidation resistance. However, compatible alloying elements are rare. For instance, some elements which improve the ductility, e.g., vanadium, chromium, and manganese, lower the oxidation resistance. Accordingly, a reasonable concept for the designer is to add effective alloying elements to improve the mechanical properties and to apply a coating to provide protection against the environment. For improved reliability, elements that improve the oxidation resistance can also be added to increase the protection unless they reduce the required mechanical properties.

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