Mechanical Response of Thermoelectric Materials

Wereszczak, Andrew A.; Case, Eldon D.

doi:10.2172/1187907

Cited by 6 publications

(8 citation statements)

References 108 publications

(174 reference statements)

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“…In addition, it is noteworthy that the tensile strength of Bi 2 Te 3 -based materials is difficult to measure owing to their brittleness, which usually results in fracture near the clamping fixture. The research on mechanical properties of Bi 2 Te 3 -based materials remains largely unexplored which is mainly ascribed to their sensitivity to flaws and their intrinsic brittle nature . Some typical strength-limiting flaws are presented in Figure , including edge-type, surface-type, and volume-type .…”

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

“…Some typical strength-limiting flaws are presented in Figure , including edge-type, surface-type, and volume-type . Also, surface pitting, edge chipping, and delamination are among the common manufacturing flaws in zone-melted Bi 2 Te 3 -based materials . Modules assembled from these flaw-containing legs have significantly reduced reliability.…”

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

“…This may be correlated with the increased concentration of voids or microcracks at grain boundaries due to the thermal expansion anisotropy (TEA) of randomly orientated grains at high temperature . Therefore, the compromise between grain refinement and TEA has to be taken into consideration in order to further optimize the mechanical strength of Bi 2 Te 3 -based materials at operational temperatures. , …”

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

“…In addition, many researchers have calculated fracture toughness based on the hardness test . But it is not as precise as the single-edge notched beam (SENB) method and should be handled carefully . The fracture toughness values obtained by SENB are in the range of 0.7–1.3 MPa m 1/2 for Bi 2 Te 3 -based materials, , which are significantly lower than the values for Mg 3 Sb 2 -based materials, half-Heusler alloys, and skutterudites .…”

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

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Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Zheng

Tan

Wan

et al. 2019

ACS Appl. Energy Mater.

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Bi 2 Te 3 -based materials are among the most mature thermoelectric materials and have found wide nearroom-temperature applications in power generation and spot cooling. Their practical applications often involve complicated service conditions, such as prolonged and large temperature gradients, clamping forces, and vibrational stresses. Thus, it is important to investigate the thermal stability and mechanical response of Bi 2 Te 3 -based materials. In this review, we summarize the recent advances in the service performances of Bi 2 Te 3 -based materials. The thermal stabilities of both nand p-type Bi 2 Te 3 -based materials are discussed when exposed to repetitive thermal loading, or fixed operational temperatures in vacuum or ambient atmosphere. Then, the mechanical responses of Bi 2 Te 3 -based materials are overviewed, including the quasi-static mechanical strength, compressive fatigue, and creep behavior. Lastly, the current concerns and future development of Bi 2 Te 3 -based materials are outlined.

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Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

Section: Mechanical Response Of Bi2te3-based Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Zheng

Tan

Wan

et al. 2019

ACS Appl. Energy Mater.

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show abstract

“…But the coarse grains and preferential crystal orientation render them in weak mechanical state, especially prone to cleavage along the van der Waal’s gap. This leads to the poor machinability, and thus various structural flaws appear in the manufactured TE legs, such as edge chipping, surface pitting, cracks, and lamellar cleavage . These defects are deleterious to the mechanical stability and reliability of module, especially making it difficult to manufacture microdevices.…”

Section: Introductionmentioning

confidence: 99%

Compressive Fatigue Behavior and Its Influence on the Thermoelectric Properties of p-Type Bi_0.5Sb_1.5Te₃ Alloys

Zheng

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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BiSbTe alloy is one of the most important thermoelectric materials that has been commercialized for large-scale applications in waste heat recovery and spot cooling. However, its practical application often involves complicated service conditions, such as substantial dynamic vibrational stresses as well as long-term exposure to the large thermal gradient that usually generates high thermal stress. Thus, it is of vital importance to investigate the mechanical response and the evolution of microstructure and thermoelectric performance of BiSbTe alloy under the quasi-static force and dynamic compressive stress. Herein, we elucidate the compressive fatigue behavior and its influence on the thermoelectric performance of p-type Bi0.5Sb1.5Te3 materials prepared by melt spinning and subsequent plasma-activated sintering. The fatigue life was tested at various stress ratios ranging from 60 to 90%. The microstructure evaluation indicates that repetitive loading of compressive stress contributes to largely accumulated strains and dislocations near grain boundaries. With the increasing cycling numbers, the magnitude of accumulated strains reaches the critical level and leads to microcrack initiation and propagation of fatigue cracks. The cyclic compressive stress resulted in the marked degradation of thermoelectric performance in Bi0.5Sb1.5Te3 material due to the strong suppression of carrier mobility by the fatigue-induced defects. This work can provide important guidance for the practical applications of p-type Bi0.5Sb1.5Te3 material.

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The Current State of Thermoelectric Technologies and Applications with Prospects

BERNIK

2023

Thermoelectric Micro/Nano Generators 2

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Mechanical Response of Thermoelectric Materials

Cited by 6 publications

References 108 publications

Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Compressive Fatigue Behavior and Its Influence on the Thermoelectric Properties of p-Type Bi_0.5Sb_1.5Te₃ Alloys

The Current State of Thermoelectric Technologies and Applications with Prospects

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Mechanical Response of Thermoelectric Materials

Cited by 6 publications

References 108 publications

Thermal Stability and Mechanical Response of Bi2Te3-Based Materials for Thermoelectric Applications

Thermal Stability and Mechanical Response of Bi2Te3-Based Materials for Thermoelectric Applications

Compressive Fatigue Behavior and Its Influence on the Thermoelectric Properties of p-Type Bi0.5Sb1.5Te3 Alloys

The Current State of Thermoelectric Technologies and Applications with Prospects

Contact Info

Product

Resources

About

Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Thermal Stability and Mechanical Response of Bi₂Te₃-Based Materials for Thermoelectric Applications

Compressive Fatigue Behavior and Its Influence on the Thermoelectric Properties of p-Type Bi_0.5Sb_1.5Te₃ Alloys