Creep control method of a85 grade aluminium

FIELD: metallurgy.

SUBSTANCE: invention can be used for control of the service life of the items made from A85 grade aluminium and operated under creep conditions. Creep control method of A85 grade aluminium involves attachment to the item from aluminium of one of the metal plates having work function that is different from aluminium. At attachment of the above plates the contact difference of potentials appears. Depending on value of potential contact difference the creep process is either slowed by connection of plate from Pb, Ti, Fe, Cu, or accelerated by connection of plate from Zr, Ni.

EFFECT: increasing service life of aluminium items.

1 tbl, 2 dwg

 

The invention relates to the field of metal processing and can be used to regulate the life of products made of aluminum brand A85 and operated under creep conditions. In particular, the invention can be used in the construction, manufacturing engines, automotive, aerospace and shipbuilding, where most of the application is aluminum and alloys on its basis.

The known method of heat treatment of aluminum, including quenching, edit, and three-aging [1]. This method increases the plasticity and, consequently, gives the possibility of accelerating creep. However, the disadvantage of this method include the inability to control the process of creep of aluminum.

Closest to the claimed method is accelerating creep due to the impact of electric current [2], namely, that in the process of creep in aluminium miss DC or AC electric current density of 0.1 A/mm2(the greater the density current is undesirable because it causes heat). The electric current passing through the material, causing the acceleration of the process of creep, and the stronger electric effect on the material, the creep flows faster. The disadvantages of this method is the lack of process plants the surveillance process creep and limitation in the use of electrical effects (up to 0.1 A/mm 2).

The objective of the invention is the management of creep technically pure aluminium brand A85 using the sum of the contact potential difference, which can increase the durability of aluminium products.

The method of controlling the creep of aluminum brand A85 is that the product of aluminium, operating under creep conditions, make the potential difference and determine its value. The potential difference is generated by connecting one of the plates of metals other than aluminum output operation: Pb, Fe, si, Zr, Ni and Ti, depending on the values of the calculated contact potential difference, the process of creep or slow down, connecting plates of Pb, Ti, Fe, si, or accelerate, connecting plates of Zr, Ni. These metals are different from aluminum work function, therefore, when their accession occurs the contact potential difference, depending on the difference works out of aluminum and acting metal. The potential resulting from connection to aluminum products metals with different work function equal according to [3, 4]

,

where AMethe electron work function of a suitable metal, And the electron work function of aluminum, e is the electron charge.

Description of the method is illustrated in figures 1 and 2. Figure 1 shows two possible ways the and connect the metal plates, aluminium products: Pb, Fe, si, Zr, Ni and Ti. Figure 2 shows how changing the speed creep depending on the connected metal.

The contact between the aluminium product and attachable metal is carried out by means of soldering or by means of the conductor (figure 1). The metal used for soldering, or the metal conductor (depending on the connection method) has no effect (according to the law volts) on the potential arising from the contact of the joining metal with a work function [5]as: Δφ=(φ1- Φ3)-(φ2- Φ3), φ1- potential products, & Phi;2the potential acting on the product of the metal, φ3- potential of the metal, used for soldering, or the metal conductor (depending on the connection method).

Research process creep of aluminum brand A85 at the end of the contact potential difference and the lack thereof showed that the effect of different metals is ambiguous, it is possible to both increase and decrease the service life of products, operating under creep conditions.

As a quantitative parameter to evaluate the effect of the contact potential difference on the process of creep was selected relative change speed creep on the linear portion of the curve creep, calculated as the ratio

,

where- the average speed of the creep specimens in case of connection of Pb, Fe, si, Zr, Ni and Ti- the average speed of the creep specimen without them.

The table shows the data of the contact potential difference and the relative changes in the rate of creep of aluminum for the studied metals, as in figure 2. depicts a generalized curve of the dependence of the effects of connected metal on the value of the relative speed creep.

The maximum velocity of creep is observed when connecting to the aluminum Zr and Ni. The minimum value of the speed creep is observed when connecting si and Pb. It should be noted that (2) in the region of 0.2<φ<+0.2 V, the effect changes sign, i.e. creep in this case slowing down.

Thus, to speed up the process of creep technically pure aluminium brand A85 is advisable to use as contact metals Zr and Ni, and to slow down should be used as the contacting metals cu, Pb, Ti and Fe.

td align="center"> -0,35
The metal in contact with the aluminumThe contact potential difference Δφ, InThe relative change speed creep ζ
Zr0,226
Pb-0,25-0,057
Ti-0,16-0,016
Fe0,06-0,016
C0,15-0,110
Ni0,250,304

The method of controlling the creep of aluminum brand A85, comprising the application to the product of aluminium, operating under creep conditions, potential difference and the definition of its value, wherein the potential difference is generated by connecting one of the plates of metals other than aluminum output operation: Pb, Fe, si, Zr, Ni and Ti, depending on the values of the calculated contact potential difference process creep or slow down, connecting plates of Pb, Ti, Fe, si, or accelerate, connecting plates of Zr, Ni.



 

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