Warm Forming and Paint Bake Response of AW-7xxx Sheet in Various Tempers

2015 ◽  
Vol 651-653 ◽  
pp. 47-52 ◽  
Author(s):  
Manoj Kumar ◽  
Nigel Ross
Keyword(s):  
Heat Treatment ◽  
Dynamic Recovery ◽  
Warm Forming ◽  
Treatment Procedure ◽  
Processing Chain ◽  
Peak Aged ◽  
One Step ◽  
The Stability ◽  
Various Tempers ◽  
Heat Treatment Procedure

In this paper, we have investigated AW-7921 in various tempers - specifically under aged T4P1-and T4P2-tempers, naturally aged T4 and peak-aged T6-tempers - for their warm formability at 230°C and paint baking response through one step and five step paint baking treatments. It was found that warm formability depends on dynamic recovery and dissolution of precipitates. However, the response to paint baking was dependent on the stability of the precipitates against coarsening. Of the tempers investigated the T4-temper exhibited the best combination of formability and paint baking response. This study also indicated that we can achieve much better performance in the warm forming processing chain by optimization of the temper and paint baking heat treatment procedure.

Magnetocaloric and other Properties of Cold Rolled Gd Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 441-445
Author(s):  
Sergey Taskaev ◽  
Vasiliy D. Buchelnikov ◽  
Anatoliy Pellenen ◽  
Dmitriy Bataev ◽  
Konstantin Skokov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Treatment Procedure ◽  
Magnetic Cooling ◽  
Cooling Devices ◽  
Cold Rolled ◽  
Heat Treatment Procedure

In this work we investigate magnetocaloric effect and heat capacity of Gd cold rolled ribbons. Such materials are easy to produce, they are flexible and convenient for using in magnetic cooling devices. It is shown that the magnetocaloric effect is strongly dependent on thickness of the ribbons. Severely rolled ribbons demonstrate rather a small magnetocaloric effect. However, a special heat treatment procedure makes it possible to enhance the effect up to the value observed in polycrystalline Gd.

Titanium-Suicide Contacts on GaAs

1985 ◽  
Vol 43 ◽  
pp. 370-371
Author(s):  
Z. Liliental ◽  
A. Wakita ◽  
C. Kocot ◽  
J. Washburn ◽  
R. Gronsky
Keyword(s):  
Heat Treatment ◽  
Electron Microscope ◽  
Cross Section ◽  
Schottky Contacts ◽  
Electrical Parameters ◽  
Treatment Procedure ◽  
X Ray ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra ◽  
Heat Treatment Procedure

Successful use of titanium silicides as contacts on Si suggested the possibility of their application as Schottky contacts on GaAs. One composition of Ti:Si with the ratio 1:3 annealed for 5 sec at 875°C was found to result in good Schottky contacts. The barrier height and ideality factor were 0.8 eV and 1.15, respectively. The same heat treatment procedure for the composition of Ti:Si 1:2 did not give satisfactory electrical parameters.Cross section samples were prepared from these contacts for both compositions and were examined in a JEOL 200 CX electron microscope. Energy dispersive X-ray (EDX) and electron energy loss spectra (EELS) were taken using a Phillips 400 FEG electron microscope at 100 KV accelerating voltage.As-deposited structures with Ti:Si ratios 1:2 and 1:3 consisted of four alternate Ti and Si layers with different thicknesses. The interface of the first Ti layer with GaAs was very flat and abrupt for both compositions.

Investigation on the optimized heat treatment procedure for laser fabricated IN718 alloy

2017 ◽  
Vol 97 ◽  
pp. 172-179 ◽  
Author(s):  
Yaocheng Zhang ◽  
Li Yang ◽  
Tingyi Chen ◽  
Weihui Zhang ◽  
Xiwang Huang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Procedure ◽  
Heat Treatment Procedure

scholarly journals Research on Heat Treatment Procedure of Deep Submergence Research Vehicle's Pressure Hull using Full Scale Model

1982 ◽  
Vol 1982 (152) ◽  
pp. 475-482
Author(s):  
Michimasa Endo ◽  
Ryoichiro Sasano ◽  
Hideyuki Morihana ◽  
Katsuto Fuchigami ◽  
Tsutomu Toyohara ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Full Scale ◽  
Scale Model ◽  
Treatment Procedure ◽  
Heat Treatment Procedure

Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-Refined Al-7 wt% Si Alloy

2010 ◽  
Vol 160-162 ◽  
pp. 412-417
Author(s):  
Xiao Song Li ◽  
An Hui Cai ◽  
Hua Chen ◽  
Ji Jie Zeng ◽  
Yong Zhou
Keyword(s):  
Heat Treatment ◽  
Holding Time ◽  
Irregular Shape ◽  
Treatment Procedure ◽  
Α Phase ◽  
Orthogonal Analysis ◽  
Optimum Heat ◽  
Equiaxed Grains ◽  
Heat Treatment Procedure ◽  
Optimum Heat Treatment

The effects of heat treatment on morphology of primary α and hardness of B-refined Al-7 wt% Si alloy are investigated. In addition, the optimum heat treatment procedure is also determined. It is shown that, at 450°C with different holding time from 3h to 12h, morphology of primary α phase is converted from irregular dendrite to granular homogeneous equiaxed grains then to rosette structure. The primary α phase is gradually converted from dendrite into the rosette dendrite and then into particle crystal with increasing of temperature by holding 8h at 300~540°C. One can find fine and uniform distributed particle α phase at 400°C or 450°C. However, the primary α phase has changed into large and irregular shape when the temperature increases up to 450°C. The orthogonal analysis shows that the optimum heat treatment parameters are 540±10°Cand 6h.

The Effect of Surface Over-Aging on the Strength and SCC Susceptibility of 7075 Aluminum Alloy

2009 ◽  
Author(s):  
Hamidreza Fooladfar ◽  
Babak Hashemi ◽  
Mousa Younesi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Shot Peening ◽  
High Strength ◽  
7075 Aluminum Alloy ◽  
Treatment Procedure ◽  
Aging Period ◽  
Two Stages ◽  
Heat Treatment Procedure ◽  
Effect Of Surface

A novel heat treatment procedure combining the shot-peening with a two-step aging operation was proposed to improve both the strength and the stress corrosion cracking (SCC) resistance of the high-strength 7075 aluminium alloy. The heat treatment included one shot-peening stage before or between the two stages of aging at 120°C for 24 h and at 160°C for 1 h, respectively. The mechanical properties obtained during the aforementioned operations were extremely similar to those of the T6 sample owing to the unaffected bulk microstructure over such a low over-aging period. The SCC resistance of these samples was considerably improved, compared to that of the T6 sample and of the conventional shot-peened T6 sample due to the over-aging of the surface like the T7 treatment leading from the diffusion acceleration by the dislocations generated in the surface layer during shot-peening. In spite of the further depth of deformation caused by shot-peening prior to the first step of aging, the sample shot-peened after the first step of aging showed no significant decrease in the SCC resistance because of its higher generated dislocation by shot-peening.

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