Isothermal transformation diagram of Cu?Zr alloys

1978 ◽  
Vol 20 (12) ◽  
pp. 1025-1026
Author(s):  
G. M. Fedorov ◽  
A. S. Kornaukhov ◽  
V. N. Fedorov
Keyword(s):  
Isothermal Transformation ◽  
Transformation Diagram ◽  
Isothermal Transformation Diagram ◽  
Zr Alloys

scholarly journals Prediction of Hardenability from Isothermal Transformation Diagram

1982 ◽  
Vol 68 (2) ◽  
pp. 292-300 ◽  
Author(s):  
Minoru UMEMOTO ◽  
Nobuo NISHIOKA ◽  
Imo TAMURA
Keyword(s):  
Isothermal Transformation ◽  
Transformation Diagram ◽  
Isothermal Transformation Diagram

Simulation of the Heat Treatment of an Automotive Cast Part

2010 ◽  
Author(s):  
Patrice Lasne ◽  
Mickael Barbelet ◽  
Olivier Jaouen ◽  
Frederic Costes ◽  
Ihab Ragai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Distribution ◽  
Isothermal Transformation ◽  
Shrinkage Porosity ◽  
Hot Tearing ◽  
Water Quenching ◽  
Dump Truck ◽  
Cast Part ◽  
Treatment Processes ◽  
Isothermal Transformation Diagram

In this paper, simulation of the casting and heat treatment processes of front spindle of a rigid dump truck are presented. The objectives are to present how the different operations can be simulated in order to predict the local phases in the different areas of the part. To reach these objectives, two software packages are used in sequenced. The first one, Thercast, is used to simulate the casting operation. The second one, Forge, is applied to the water-quenching simulation. The general formulations used are shortly presented in this paper. The aim of casting simulation is to compute the metal behavior from the liquid state at the pouring stage to the solid state during cooling into the mold. Filling and cooling phases simulations, taking into account the air gap, ensure that no internal defects like shrinkage, porosity, micro porosity or hot tearing are taking place into the part. Forge software allows the water quenching stage simulation. A model is used to deduct the IT diagram (Isothermal Transformation diagram) from the material composition. The initial grain size influences the transformation kinetics. Another main phenomenon is the efficiency of the cooling bath. The results of the simulation (phase distribution, distortion, residual stresses) strongly depend on these input conditions. Thus, the effect of input data variations on final results must be studied. The modeling approach is validated by comparisons with micrographic observations. Another solution to determine the reliability of the models is to observe the local properties in the quenched part. The prediction of the local micro hardness can be used to evaluate the accuracy of the quenching models.

Precipitation in Al-Li-Zr alloys

1992 ◽  
Vol 50 (1) ◽  
pp. 186-187
Author(s):  
D.M. Vanderwalker
Keyword(s):  
Fracture Toughness ◽  
Precipitation Hardening ◽  
Weight Ratio ◽  
High Strength ◽  
Transmission Electron ◽  
Water Quench ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

THE STRUCTURE OF AMORPHOUS Ni-Zr ALLOYS

1985 ◽  
Vol 46 (C8) ◽  
pp. C8-181-C8-185
Author(s):  
A. E. Lee ◽  
S. Jost ◽  
Ch. N.J. Wagner ◽  
L. E. Tanner
Keyword(s):  
Zr Alloys
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