Research Article
Influence of Temperature on Creep Resistance, Structural and Electrical Characteristics of S9Z1 Eutectic Alloys
Gobran Naji Ali
,
Mohammed Saleh Nasser Al-Salmi*
Issue:
Volume 13, Issue 4, August 2024
Pages:
61-70
Received:
4 July 2024
Accepted:
30 July 2024
Published:
15 August 2024
Abstract: In the present study, the structural and creep resistance properties of S9Z1 alloys with Cu-addition in concentrations (0.1 and 0.3% Wt.) have been investigated using x-ray diffractions (XRD) and Creep testing machine respectively. The three samples were prepared from high purity 99.99% by melting technique in the Pyrex tubs with CaCl2 to invaded the oxidation. The obtained samples were rolled drawn (cold rolling) into two groups. The first group was as wires for the creep resistance testing. The second group was as small sheets for structural investigations. Patterns of XRD showed that the S9Z1 alloy was primarily composed of two phases; a body centered tetragonal β-Sn matrix phase, and a secondary phase of hexagonal Zn. while with addition Cu (0.1 and 0.3% Wt.) to S9Z1 Alloys the results showed new peaks in the ternary compositions, such as Cu6Sn5, Cu5Zn8, phases respectively. The average of particle size (D) of β-Sn matrix was decreased with increasing Cu -adding, whereas the dislocation density (δ) increased with increasing addition. Creep properties of S9Z1, S9Z2 and 3 Alloys were examined at different temperatures (25, 40 and 80°C) under two constant loads (σ= 18.7 and 24.94 MPa). The creep behaviors of ternary alloys were higher than the S9Z1 alloys with all different temperatures under two constant loads. Also, the S9Z3 alloy with all different temperatures and two loads exhibited greatest creep resistance, due to the refinement structure and formation of new IMCs. Values of stress exponent (n) were found to be in the range of 1 to 10.55, for all S9Z2 and 3 alloys respectively. Values of activation energy (Q) of alloys were found to be in the range of 36.48 to 37.49 kJ/mol, for σ = 18.7 Mpa and 27 to 34.8 kJ/mol for σ = 24.94 Mpa for the S9Z1 alloys with Cu addition respectively. At room temperature (25°C), the electrical conductivity of the samples was calculated, and its values increased with Cu additions.
Abstract: In the present study, the structural and creep resistance properties of S9Z1 alloys with Cu-addition in concentrations (0.1 and 0.3% Wt.) have been investigated using x-ray diffractions (XRD) and Creep testing machine respectively. The three samples were prepared from high purity 99.99% by melting technique in the Pyrex tubs with CaCl2 to invaded t...
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Research Article
Thermal Performance of Clay and Millet Waste Compressed Earth Blocks Stabilized with Cement
Issue:
Volume 13, Issue 4, August 2024
Pages:
71-80
Received:
3 July 2024
Accepted:
1 August 2024
Published:
20 August 2024
DOI:
10.11648/j.ijmsa.20241304.12
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Abstract: As a contribution of the building sector to mitigating the effects of climate change, namely rising sea levels, floods, droughts, cyclones, sandstorms, retreat of arable land and forest fires, in anticipation of the objectives of the Paris Agreement, on the one hand, and energy efficiency on the other hand and the development of sustainable and environmentally friendly building materials, this paper presents the thermal characterization of compressed earth blocks using two clays used by the population of MARADI in Niger for the construction of habitats. The clays are mixed with sand (10%), cement (4%) and varying proportions of millet waste from 0% to 10%. The study shows that the thermal conductivity of composites decreases as the amount of millet waste increases. Conversely, the thermal resistance increases with each addition. Conductivity values varies from 0.268 W. m−1.K−1 to 0.644 W. m−1.K−1 for MARADAWA clay (BAM) samples and from 0.275 W. m−1.K−1 to 0.723 W. m−1.K−1 for Jiratawa clay (BAJ) samples. This represents a reduction of 61.96% for Jiratawa clay and 58.39% for MARADAWA clay compared to non-added materials. Composite materials are more effective in terms of thermal insulation.
Abstract: As a contribution of the building sector to mitigating the effects of climate change, namely rising sea levels, floods, droughts, cyclones, sandstorms, retreat of arable land and forest fires, in anticipation of the objectives of the Paris Agreement, on the one hand, and energy efficiency on the other hand and the development of sustainable and env...
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