Hardness and Fracture Toughness of Solid Solutions of Mg2Si and Mg2Sn

Hernández, Gustavo Castillo; Yasseri, Mohammad; Ayachi, Sahar; Boor, Johannes de; Müller, Eckhard

doi:10.1134/s1063782619130098

Cited by 6 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the as-fabricated Mg 2 Sn/Mg 3 Sb 2 HCnC, the increased solubility of Sb in Mg 2 Sn (or Sn in Mg 3 Sb 2 ) may be related to the incomplete phase separation in the sintering process or stress constrain from the counter phase. Additionally, the as-fabricated Mg 2 Sn/Mg 3 Sb 2 HCnCs show an average fracture toughness K IC of 2.60 MPa m 1/2 , much higher than the pure Mg 3 Sb 2 (2.19 MPa m 1/2 ) and Mg 2 Sn (0.64 MPa m 1/2 ) phases. They also have a high Vickers hardness H v in the range of 1.9–2.1 GPa (Section SB and Figure S5).…”

Section: Results and Discussionmentioning

confidence: 95%

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Zhu

Han

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Nano approaches are practical strategies to boost the thermoelectric figure of merit due to the strong phonon scattering from the grain boundaries and nanoinclusions. Here, we have reported a strong phonon scattering at the heterogeneous interfaces of Mg 2 Sn/Mg 3 Sb 2 high-content nanocomposites (HCnCs). As a result, a significantly reduced lattice thermal conductivity of 1.09 W m −1 K −1 was observed in the equimolar Mg 2 Sn/Mg 3 Sb 2 HCnC, 80% lower than pure Mg 2 Sn and 25% lower than pure Mg 3 Sb 2 . As a result, a high ZT ∼ 1.13 at 773 K was achieved in the Mg 2 Sn/Mg 3 Sb 2 HCnC. Furthermore, various defects, including solid solutions, nanoinclusions, and misfit dislocations, were observed in both the Mg 3 Sb 2 phase and the Mg 2 Sn phase through the microstructure characterization.

show abstract

Section: Results and Discussionmentioning

confidence: 95%

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Zhu

Han

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The modulus reduces with increasing temperature and easily deforms above the yield stress at elevated temperatures. Mg 2 Si 1– x Sn x solid solutions exhibit a reasonable value of Vickers hardness (3.07–3.54 GPa) but demonstrate low fracture toughness in a range of 0.64–1.0 MPa·m 1/2 . ,, This value falls between the lowest (0.35 MP·m 1/2 ) for PbTe and the highest (2.8 MPa·m 1/2 ) for Ca 3 Co 4 O 9 , and is comparable to the soda-lime glass (0.7–0.8 MP·m 1/2 ) . The bending strength of Sb-doped Mg 2 Si fabricated by SPS is 57 MPa at room temperature, and the tensile strength for Mg 2 Si with glass inclusions was ∼2 MPa …”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 77%

“…69 The elastic modulus of the Mg 2 Si-based TE materials ranges from 58 to 145 GPa, with their corresponding hardness values ranges from 2.4 to 5.6 GPa, which are higher than those of Bi 2 Te 3 (32−52 GPa) and PbTe (27−58 GPa) based TE materials. 71,72 These values are affected by differences in grain size according to the production methods, i.e., induction melted casting or spark plasma sintering. The Mg 2 Sn compound shows a Young's modulus of 82 GPa and a hardness of 1.7 GPa.…”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

“…The Mg 2 Sn compound shows a Young’s modulus of 82 GPa and a hardness of 1.7 GPa. 72 The formation of defects, such as pores and cracks can reduce the elastic modulus. 73 The modulus reduces with increasing temperature and easily deforms above the yield stress at elevated temperatures.…”

Section: Challenges and Major Issues Of The Magnesium-based Te Materi...mentioning

confidence: 99%

See 1 more Smart Citation

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Zhang,

Gurtaran,

Dong

2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Magnesium-based thermoelectric (TE) materials have attracted considerable interest due to their high ZT values, coupled with their low cost, widespread availability, nontoxicity, and low density. In this review, we provide a succinct overview of the advances and strategies pertaining to the development of Mg-based materials aimed at enhancing their performance. Following this, we delve into the major challenges posed by the severe working conditions, such as high temperature and thermal cycling, which adversely impact the behavior and long-term stability of the TE modules. Challenges include issues like the lack of mechanical strength, chemical instability, and unreliable contact. Subsequently, we focus on the key methodologies aimed at addressing these challenges to facilitate the broader application of the TE modules. These include boosting the mechanical strength, especially the toughness, through grain refining and additions of second phases. Furthermore, strategies targeted at enhancing the chemical stability through coatings and modifying the microstructure, as well as improving the contact design and materials, are discussed. In the end, we highlight the perspectives for boosting the practical applications of Mg-based TE materials in the future.

show abstract

“…However, the research work emphasis on mechanical stability is minimal. High brittleness associated with high crack propagation in Mg 2 Si 1– x Sn x material drives low mechanical reliability, impeding their practical applications in thermoelectric devices. , For thermoelectric generator applications, the material should possess superior thermoelectric properties, high thermal stability, and mechanical robustness. Recently, the temperature-dependent mechanical properties of Mg 2 Si 1– x Sn x materials have been reported, varying the Si/Sn composition by G. Castillo-Hernandez et al Unfortunately, the mechanical properties enhancement in Mg 2 Si 1– x Sn x employing various techniques such as nanostructuring and nanoinclusions leads to inferior thermoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Power Factor and Mechanical Properties in Low Cost Mg₂Si_1–xSn_x Employing a Composite Approach

Choudhary

Muthiah

Dhakate

2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

High cost, toxicity, and thermal instability issues curtail the usage of thermoelectric power generators (TEGs) for waste heat recovery applications. Mg2Si1–x Sn x based thermoelectric material is a proven low cost, nontoxic, and earth crust abundant material for mid-temperature device applications. Still, its thermal stability and mechanical properties remain challenging and unascertained. This work reports a facile and simple production of Mg2Si1–x Sn x material employing a composite approach using an in situ plasma-assisted reaction sintering process. The enhanced thermoelectric properties associated with a remarkable hardness value of ≃5.2 GPa and high fracture strength of ≃2.17 MPa√m were realized in plasma-assisted reactive sintered Mg2Si1–x Sn x material, using suitable doping and reinforcement additions. The synthesized composite material improves the mechanical robustness and superior thermoelectric performance, which is a prerequisite for ensuring the commercial viability of Mg2Si1–x Sn x based materials.

show abstract

Hardness and Fracture Toughness of Solid Solutions of Mg2Si and Mg2Sn

Cited by 6 publications

References 33 publications

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Enhancement of Power Factor and Mechanical Properties in Low Cost Mg₂Si_1–xSn_x Employing a Composite Approach

Contact Info

Product

Resources

About

Hardness and Fracture Toughness of Solid Solutions of Mg2Si and Mg2Sn

Cited by 6 publications

References 33 publications

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg2Sn/Mg3Sb2 High-Content Nanocomposite

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg2Sn/Mg3Sb2 High-Content Nanocomposite

Low-Cost Magnesium-Based Thermoelectric Materials: Progress, Challenges, and Enhancements

Enhancement of Power Factor and Mechanical Properties in Low Cost Mg2Si1–xSnx Employing a Composite Approach

Contact Info

Product

Resources

About

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Enhanced Thermoelectric Performance by Strong Phonon Scattering at the Heterogeneous Interfaces of the Mg₂Sn/Mg₃Sb₂ High-Content Nanocomposite

Enhancement of Power Factor and Mechanical Properties in Low Cost Mg₂Si_1–xSn_x Employing a Composite Approach