Solution heat treatment

Modifications to Precipitates. Silicon is sometimes added to Al—Cu—Mg alloys to help nucleate S precipitates without the need for cold work prior to the elevated temperature aging treatments. Additions of elements such as tin [7440-31-5] Sn, cadmium [7440-43-9] Cd, and indium [7440-74-6] In, to Al—Cu alloys serve a similar purpose for 9 precipitates. Copper is often added to Al—Mg—Si alloys in the range of about 0.25% to 1.0% Cu to modify the metastable precursor to Mg2Si. The copper additions provide a substantial strength increase. When the copper addition is high, the quaternary Al CuMg Si Q-phase must be considered and dissolved during solution heat treatment. 

Solution heat treated and naturally aged. Material which receives no cold work after solution heat treatment except as may be required to flatten or straighten it. Properties of some alloys in this temper are unstable... 

Solution heat treatment. This improves mechanical properties by maximizing the concentration of hardening constituents in the solid solution. 

Homogenizing, annealing, and aging are dry processes whereas solution heat treatment typically involves significant quantities of contact cooling water. 

Direct chill casting or continuous rod casting Solution heat treatment Cleaning or etching... 

Continuous sheet casting Solution heat treatment... 

This paper describes the successful synthesis and examination of polyfr-(amino /9-thiosulfate) ether] (PATE), a water soluble photolabile polymer. Evidence has been presented that the PATE polymer is zwitterionic and forms weak associations in aqueous solutions. Heat treatment of PATE films result in extensive crosslinking, presumably through a disulfide bond. This work presents strong evidence that PATE is activated by deep UV radiation, and that a disulfide crosslink is formed. Sensitization experiments demonstrate that the crosslinking reaction can be induced by a triplet sensitizer. Finally, preliminary results point out the potential for application of PATE films as active photoimaging systems. 

The specification permits this material to be furnished without solution heat treatment or with other than a solution heat treatment. When the material has not been solution heat treated, the minimum temperature shall be -29°C (-20°F) unless the material is impact tested per para. GR-2.1.3. 

In terms of practical use, one of the most important features of phase equilibria can often be the effect of composition on some critical temperature. This can be a liquidus or solidus or a solid-state transformation temperature, such as the /3-transus temperature, (T ), in a Ti alloy. The solidus value can be critical, as solution heat-treatment windows may be limited by incipient melting. In some materials a solid-state transformation temperature may be of prime importance. For example, in Ti alloys it may be specified that thermomechanical processing is performed at some well-defined temperature below the / -transus temperature. The CALPHAD route provides a method where such temperatures can be quickly and reliably calculated. 

TF is solution heat treatment followed by precipitation hardening. 

NATIONAL (cont.) solution heat treatment contact cooling water 13.10 6.518 ... 

Aluminum brasses Precipitation of CuA12 at grain boundaries and formation of Cu depleted zones adjacent to grain boundaries results in a potential difference of 200 mV between the boundary and the grain and results in intergranular cracking resistance or immunity to SCC can be achieved by quenching from solution heat-treatment temperature... 

Feng and coworkers prepared nanocrystalline tin oxide on monolithic mesoporous silica starting from Sn(acac)2Cl2 by simple immersing of the substrate in the precursor solution. Heat treatment (300-600 °C) leads to nanocomposites with a large specific surface area. The electrical properties of these nanocomposites were also investigated. The authors found an inverse correlation between the precursor concentration and the electrical resistivities of the samples. ... 

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