Microstructural Origins of Variability in the Tensile Ductility of Tilt-Pour Permanent Mold Cast Al Alloy at a Warm Temperature

2013 ◽  
Vol 50 (4) ◽  
pp. 252-262
Author(s):  
A. M. Gokhale ◽  
G. R. Patel
Keyword(s):  
Tensile Ductility ◽  
Al Alloy ◽  
Permanent Mold ◽  
Warm Temperature ◽  
Permanent Mold Cast

The Structure and Properties of Boundaries in Bicrystals of Boron-Doped Ni3(Al,l at% Ta)

1990 ◽  
Vol 213 ◽  
Author(s):  
M. J. Mills ◽  
S. H. Goods ◽  
S. M. Foiles
Keyword(s):  
Room Temperature ◽  
Tensile Ductility ◽  
Al Alloy ◽  
Boron Doped ◽  
Transmission Electron ◽  
Temperature Heat ◽  
Atomistic Calculations ◽  
Rate Of Cooling ◽  
Temperature Heat Treatment ◽  
Ductile State

ABSTRACTThe effect of boron on the structure and macroscopic properties of an isolated grain boundary in bicrystals of a non-stoichiometric Ni3Al alloy (76 at% Ni, 23 at% Al, 1 at%Ta) has been studied. The room temperature tensile ductility and fracture mode of the bicrystals varies dramatically with the rate of cooling after elevated temperature heat treatment. In the absence of significant segregation of boron to the boundary, the bicrystals fail via brittle interfacial fracture with little or no ductility. When the segregation of boron to the boundary is maximized, the bicrystals are highly ductile. High resolution transmission electron microscopy reveals that this ductile state is achieved without the formation of a detectable region of compositional disorder at the boundary. Atomistic calculations using a Monte Carlo scheme predict that only partial disordering of the planes immediately adjacent to the boundary should occur for Ni-rich alloys both with and without boron. These results suggest that the presence of boron causes an increase in the cohesive energy of the boundaries rather than a change in the local compositional ordering.

Corrosion Behaviors of Permanent Mold Cast Mg Alloy AJ62 with Varying Grain Structures in Automotive-Related Environments

2017 ◽  
Vol 865 ◽  
pp. 9-14
Author(s):  
Li Fang ◽  
Jonathan Burns ◽  
Henry Hu ◽  
Xue Yuan Nie ◽  
Jimi Tjong
Keyword(s):  
Coarse Grained ◽  
Permanent Mold ◽  
Thick Section ◽  
Salt Solutions ◽  
Fine Grained ◽  
Grain Structures ◽  
Fine Microstructure ◽  
Corrosion Behaviors ◽  
Permanent Mold Cast ◽  
Engine Coolant

Permanent mold cast (PMC) AJ62 magnesium alloy exhibits a fine-grained microstructure in the thin section and a coarse-grained microstructure in the thick section. Microstructure of the PMC AJ 62 alloy was analyzed by using the Scanning Electron Microscopy (SEM). Potentiodynamic polarization experiments were performed to investigate the corrosion resistances of the PMC AJ62 alloys in salt solutions and engine coolant. The corrosion behaviors in the fine- and coarse-grained AJ62 alloys were compared. The results show that the AJ62 alloy with fine microstructure presents enhanced corrosion resistance.

scholarly journals Grain Refinement of Permanent Mold Cast Copper Base Alloys

2005 ◽  
Author(s):  
M.Sadayappan ◽  
J.P.Thomson ◽  
M.Elboujdaini ◽  
G.Ping Gu ◽  
M. Sahoo
Keyword(s):  
Grain Refinement ◽  
Permanent Mold ◽  
Copper Base ◽  
Permanent Mold Cast

ALUMINUM ALLOY 771.0

Alloy Digest ◽  
1995 ◽  
Vol 44 (8) ◽  
Keyword(s):  
Aluminum Alloy ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Room Temperature ◽  
Heat Treating ◽  
Permanent Mold ◽  
Permanent Mold Cast

Abstract ALUMINUM ALLOY 771.0 can be sand or permanent mold cast and naturally aged at room temperature. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on casting, heat treating, machining, joining, and surface treatment. Filing Code: AL-338. Producer or source: Various aluminum companies.

Warm-temperature tensile ductility in Al-Mg alloys

1998 ◽  
Vol 29 (3) ◽  
pp. 1081-1091 ◽  
Author(s):  
Eric M. Taleff ◽  
Gregory A. Henshall ◽  
T. G. Nieh ◽  
Donald R. Lesuer ◽  
Jeffrey Wadsworth
Keyword(s):  
Tensile Ductility ◽  
Mg Alloys ◽  
Warm Temperature ◽  
Al Mg Alloys

Microstructure and Aging Behavior of AZ91 Mg Alloy Fabricated by Inclined Cooling Plate

2006 ◽  
Vol 116-117 ◽  
pp. 350-353 ◽  
Author(s):  
Sung Yong Shim ◽  
Su Gun Lim
Keyword(s):  
Aging Treatment ◽  
Permanent Mold ◽  
Cooling Plate ◽  
Solid Specimen ◽  
Hardness Tests ◽  
Heat Treated ◽  
Cast Specimen ◽  
Az91 Magnesium ◽  
Semi Solid ◽  
Permanent Mold Cast

Semi-solid AZ91 magnesium alloys were produced using a cooling plate followed by quenching in the mold. The cast and T6 heat treated microstructures were microscopically characterized and subjected to hardness tests. It was found that the resultant microstructure in water quenched semi-solid specimen were finer than that in conventional permanent mold cast specimen. The hardness tests also showed that the hardness of quenched semi-solid cast specimen was higher than that of permanent mold cast specimen. This was attributed to large amount of precipitates which results from fine precipitation of eutectic phase at intergranular areas during the aging treatment after its complete dissolution.

Improvement in Strength of 2024 Al Alloy by Enhanced Solution Treatment

2005 ◽  
Vol 297-300 ◽  
pp. 2362-2367 ◽  
Author(s):  
Xiao Jing Xu ◽  
Seock Sam Kim ◽  
Y.S. Zheng
Keyword(s):  
Tensile Ductility ◽  
Solution Treatment ◽  
Melting Behavior ◽  
Solution Temperature ◽  
Al Alloy ◽  
Incipient Melting ◽  
Tension Testing ◽  
Constituent Phase ◽  
Conventional Solution ◽  
Phase Solution

In this paper the effects of an enhanced solution and aging on the strengthening behavior of commercially available 2024Al alloy were investigated using tension testing and scanning electron microscopy. A differential scanning calorimeter (DSC) was used to measure the incipient melting behavior and then determine the technological parameter of an enhanced solution heat treatment for strengthening the 2024Al alloy. The results show that the incipient melting behavior of the commercially available 2024Al alloy was characterized by a small amount of liquid phase between the temperatures 773K to 788K. A solution treatment, appropriately enhanced by slowly increasing the solution temperature from 773K to 783K at a heating rate of 5K/h, can make the final solution temperature of the alloy higher than the conventional solution temperature of 773K. This improves the constituent phase solution without the formation of overheated microstructures. The results are the strength, especially the yield strength, and the resistance to over-aging can both be considerably improved without a large deterioration to tensile ductility.

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