Mechanical testing of steel/aluminium–silicon interfaces by pushout

Dezellus, Olivier; Digonnet, B.; Sacerdote-Peronnet, M.; Bosselet, F.; Rouby, D.; Viala, J.C.

doi:10.1016/j.ijadhadh.2006.09.003

Cited by 18 publications

(10 citation statements)

References 9 publications

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“…Before immersion of the Ti rod the bath was regularly stirred (during a few hours) and the surface oxide skin removed. The bottom of the crucible was machined and a device put on its top so that the titanium insert was perfectly vertical and centered (see [6] for more details on the experimental apparatus). The dipping temperature was measured with a precision better than 0.2°C by plunging in the melt a K-type (Ni/Cr) thermoelectric couple.…”

Section: Element Simentioning

confidence: 99%

Mechanical testing of titanium/aluminium–silicon interfaces by push-out

et al. 2008

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Abstract:Mechanical properties of Ti/Al-7Si assemblies produced by insert moulding have been studied with a classical push-out test and a variant that is the circular bending test. Special care has been taken for controlling both the reactivity at theTi/Al-7Si interface and the metallurgical health of the Al-7Si matrix. Mechanical tests until complete debonding have been completed with interrupted tests, metallographic characterizations and FEM analysis of elastic stress state. A mean shear strength of the interface of about 120 MPa has been obtained. When the Ti insert is solely fretted in the matrix, without chemical interaction between Ti and the Al-7Si alloy, the mean shear strength is significantly lower (48 MPa). This result clearly shows that chemical interaction at the interface (formation of a thin TiSi layer at the Ti side and a thick Al 3 Ti(Si) layer at the Al-7Si alloy side) improves the mechanical properties of the assembly. It is also shown that the failure sequence is characterized both by crack propagation from bottom to top and matrix yielding from top to bottom. Actually, interface damaging begins by crack initiation at the specimen bottom face (not at the top face, under the indenter) in a nearly pure mode I solicitation at a radial tensile stress of about 100 MPa.

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Section: Element Simentioning

confidence: 99%

Mechanical testing of titanium/aluminium–silicon interfaces by push-out

et al. 2008

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“…Under these conditions, a mechanically strong and tough bond can be established at the insert/alloy interface. [20][21][22] When aluminium-silicon alloys such as AlSi5Cu3Mg (A-S5U3G) or AlSi7Mg0.3 (A-S7G03) are used to produce moulded parts by conventional casting, a thermal treatment designated as T6 is generally applied, consisting of the following steps: isothermal holding at 520-540°C (793-813 K) for 20-10 h, quenching in cold water and finally ageing for 5-10 h at 170-180°C (443-453 K). This treatment, which combines solution heat treatment with spheroidization of silicon second phase and age hardening, has the beneficial effects of increasing both the ultimate tensile strength (by about 50%) and the 0.2% proof stress (by a factor of 2).…”

Section: Introductionmentioning

confidence: 99%

Chemical Changes at the Interface Between Low Carbon Steel and an Al-Si Alloy During Solution Heat Treatment

Zhe

Dezellus

Gardiola

et al. 2011

J. Phase Equilib. Diffus.

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The aim of this work was to characterize the chemical changes during solid state solution heat treatment of a metallurgically bonded steel/Al-Si interface. For this purpose, low carbon steel plates covered with the A-S7G03 aluminium alloy (7 wt.% Si, 0.3 wt.% Mg analogous to A356) were prepared by dip coating, water-quenching to room temperature and reheating in the solid state at 480-560°C for 3-160 h. Upon reheating at 535°C, a reaction layer was observed to grow at the interface between steel and the iron-saturated Al-Si alloy. As long as an intimate contact could be maintained, the total thickness, x, of the reaction layer increased with time, t, according to a nearly parabolic growth law x 2 = KAEt 2 b. At 535°C, the value of the growth constant was K = 4.045310 214 m 2 s 21 . This constant was found to be thermally activated [K = K 0 exp(2Q/ RT)] with K 0 = 4.37310 24 m 2 s 21 and Q = 153 kJ mol 21 . The whole chemical interaction process was controlled by solid state volume diffusion and the reaction layer sequence corresponded to a diffusion path in the Al-Fe-Si phase diagram. A striking feature of the reaction process is the unbalanced diffusion of aluminium atoms through the reaction zone which rapidly results in the formation of Kirkendall voids. As these voids coalesce, solid state diffusion becomes more and more difficult and the steel/alloy bond gets weakened. Oxidation appears to be an aggravating factor, where applicable.

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“…[7]. It is worth recalling that aluminization was performed at 705-720 • C during approximately 10 min and that special care was taken during cooling in order to achieve a good metallurgical health of the casting.…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies have therefore examined means of reinforcing such alloys with stiff alumina [4], silicon carbide [5] or boron carbide fibers and particles [3]. An alternative solution would be to locally reinforce the light alloy with steels, cast iron or titanium to improve the mechanical properties of aluminium-based castings [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…More precisely, a chemical reaction proceeds between the liquid aluminium alloy and the solid titanium insert, giving rise to the formation of a thin (less than 10 m thick) and continuous interface reaction layer. The mechanical properties of the resulting Ti/Al-7Si-0.3Mg joints, as evaluated by tensile testing [9] or pushout testing [1], have been shown to be higher than those of similar joints formed between cast iron inserts and an Al-7Si-0.3Mg alloy [9], or between mild steel inserts and an Al-13Si alloy [7]. Furthermore, it is well known that the mechanical properties of the magnesium-containing aluminium-silicon alloys can be enhanced by a heat treatment, of which the most widely used is the T6 treatment, made up of a solution treatment at 520-550 • C followed by quenching and artificial ageing [10].…”

Section: Introductionmentioning

confidence: 99%

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