Microstructural evolution of AZ61-10at.%Ti composite powders during mechanical milling

Yu, Huashun; Sun, Yu; Hu, Lianxi; Zhou, Haiping; Wan, Zhipeng

doi:10.1016/j.matdes.2016.05.014

Cited by 36 publications

(18 citation statements)

References 45 publications

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“…After 1 turn, the average grain size could reach about 260 nm. Meanwhile, dynamic balance was achieved between the grain refining caused by plastic deformation and grain growth induced by thermal effect [ 31 ]. Even so, the grains of the LZ91 alloy were refined slightly.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

et al. 2018

Materials

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Microstructural evolution and mechanical properties of LZ91 Mg-Li alloy processed by high-pressure torsion (HPT) at an ambient temperature were researched in this paper. The microstructure analysis demonstrated that significant grain refinement was achieved after HPT processing with an average grain size reducing from 30 μm (the as-received condition) to approximately 230 nm through 10 turns. X-ray diffraction analysis revealed LZ91 alloy was consisted of α phase (hexagonal close-packed structure, hcp) and β phase (body-centered cubic structure, bcc) before and after HPT processing. The mean value of microhardness increased with the increasing number of HPT turns. This significantly increased hardness of specimens can be explained by Hall-Petch strengthening. Simultaneously, the distribution of microhardness along the specimens was different from other materials after HPT processing due to the different mechanical properties of two different phases. The mechanical properties of LZ91 alloy processed by HPT were assessed by the micro-tensile testing at 298, 373, 423, and 473 K. The results demonstrate that the ultra-fine grain LZ91 Mg-Li alloy exhibits excellent mechanical properties: tensile elongation is approximately 400% at 473 K with an initial strain rate of 1 × 10−2 s−1.

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Section: Resultsmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

et al. 2018

Materials

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“…Thus, it was confirmed that grain size effect would influence the forming behavior during micro‐embossing and UFG‐grained materials were of better formability. As is known to all, the grain boundary content of CG and UFG grained materials was evident differed, which resulted in the various microstructural evolutions and deformation mechanisms at elevated temperatures. Therefore, an analysis on the relationship between forming behavior and deformation mechanism, viewed from the microstructure point, became particularly significant to fabricate corresponding MEMS components with the high quality of geometry.…”

Section: Introductionmentioning

confidence: 95%

Effect of Grain Size on Formability and Deformation Mechanism of High‐Purity Aluminum during Micro‐Embossing Process at Elevated Temperature

et al. 2019

Adv Eng Mater

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Due to the high processing efficiency, the low manufacturing cost, and the emission of carbon dioxide, microforming attracts considerable attention in the field of microelectromechanical systems. Thus, the micro-embossing process is carried out for the high purity Al of coarse-grained (CG) and ultrafine-grained (UFG) microstructure at temperature ranging from 373 to 523 K. The interactive effects of grain size and temperature on formability are investigated. The results indicate that UFG pure Al is of better geometrical accuracy and surface quality in comparison with CG pure Al. Meanwhile, with the increasing temperature, the filling behavior of UFG pure Al is optimized and both CG and UFG pure Al reach full filling after embossing process at 523 K. Based on the observation of the microstructure of embossed ribs, plastic deformation together with the heat effect trigger the recrystallization of the CG pure Al and the grain growth of the UFG pure Al. The deformation mechanisms of CG and UFG pure Al are clarified, according to the evolution of misorientation angle distribution and kernel average misorientation. It is confirmed that intergranule movement for UFG pure Al includes grain boundary sliding and grain rotation accounted for the excellent formability.

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“…In conventional view, the smaller particles are, the better properties of the ceramic there will be, prepared under the same process conditions [23]. Therefore, a lot of researches are focusing on particle refinement [13,[23][24][25][26]. However, almost all the refining processes are along with problems including long time, high noise and potential safety hazards, which makes the simple SiC powder sintering process seem more complicated.…”

Section: Introductionmentioning

confidence: 99%

Silicon carbide low temperature sintering: the particle size effect of raw materials and sintering additive

Xue-ping

Zhang

et al. 2020

Mater. Res. Express

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Aiming at dense sintering of silicon carbide ceramic, magnesium alloy powder was taken as additive, and silicon carbide powders with two different particle size were sintered by the same hot pressure sintering process. Result shows that ceramic sintered by the powder with larger particle size is denser. Magnesium and carbon segregation is observed in the sample prepared by powder with smaller particle size, in which silicon carbide particles cannot be uniformly dispersed by sintering additives. However, sintering additives distribute homogeneously among silicon carbide particles in the sample prepared by powder with larger particle size, which can effectively play a bonding role. In the selection of liquid phase sintering additives, particle size matching of raw material and sintering additives should be emphasized. Materials and methods Raw materialsSilicon carbide powders (purity >99%) with two different particle sizes were taken as raw materials and 8 wt% magnesium alloy powder as additive (Mg94.0 wt%, Al∼2.5 wt%-3.5 wt%). Average particle sizes of silicon carbide are 0.09 μm and 3.31 μm respectively, and average particle size of magnesium alloy is 86.30 μm.

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Microstructural evolution of AZ61-10at.%Ti composite powders during mechanical milling

Cited by 36 publications

References 45 publications

Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

Effect of Grain Size on Formability and Deformation Mechanism of High‐Purity Aluminum during Micro‐Embossing Process at Elevated Temperature

Silicon carbide low temperature sintering: the particle size effect of raw materials and sintering additive

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