Microstructure thermal stability of nanocrystalline AZ31 magnesium alloy with titanium addition by mechanical milling

The thermal stability of the superhydrophobic properties of coatings obtained on a magnesium alloy by plasma electrolytic oxidation (PEO) followed by treatment with fluoropolymer was studied. It was established that formed surface layers have contact angle (CA) equal to 171° and contact angle hysteresis equal to 6° at 25 °C, which allows to characterize them as superhydrophobic. After 5 cycles of cooling-heating of composite layers, CA was 135°, indicating the durability of coatings. Additionally, obtained polymer-containing layers demonstrated low wettability at 0 °C (CA was 105°).

Download Full-text

Thermal Stability of Ultra-Fine Grained Magnesium Alloy Processed by Extrusion and ECAP

Magnesium Technology 2013 ◽

10.1007/978-3-319-48150-0_29 ◽

2013 ◽

pp. 175-179

Author(s):

Jitka Vrátná ◽

Miloš Janeček

Keyword(s):

Thermal Stability ◽

Magnesium Alloy ◽

Fine Grained ◽

Thermal Stability Of

Download Full-text

Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP

Materials Characterization ◽

10.1016/j.matchar.2015.07.009 ◽

2015 ◽

Vol 107 ◽

pp. 167-173 ◽

Cited By ~ 7

Author(s):

Libor Pantělejev ◽

Roman Štěpánek ◽

Ondřej Man

Keyword(s):

Thermal Stability ◽

Magnesium Alloy ◽

Bimodal Microstructure ◽

Alloy Az91 ◽

Magnesium Alloy Az91 ◽

Thermal Stability Of

Download Full-text

Thermal stability of nanocrystalline WC–Co powder synthesized by using mechanical milling at low temperature

Journal of Materials Research ◽

10.1557/jmr.2001.0071 ◽

2001 ◽

Vol 16 (2) ◽

pp. 478-488 ◽

Cited By ~ 13

Author(s):

Jianhong He ◽

Leoanardo Ajdelsztajn ◽

Enrique J. Lavernia

Keyword(s):

Thermal Stability ◽

Particle Size ◽

Mechanical Milling ◽

Gradual Increase ◽

Thermal Exposure ◽

X Ray Diffraction ◽

Cryomilled Powder ◽

X Ray ◽

Increasing Temperature ◽

Thermal Stability Of

Nanostructured WC–18% Co powder was synthesized by using cryogenic mechanical milling, and the thermal stability of the nanostructured powder was investigated in detail. The results indicated that the as-synthesized WC–18% Co powder had an average WC particle size of 25 nm. Growth of WC particles occurred above 873 K; however, the average WC particle size remained smaller than 100 nm in the powder isothermally heated for 4 h at 1273 K. Thermal exposure in air at T < 623 K did not result in significant oxidation of the cryomilled powder. The thermal exposure did promote the formation of WO2 and WO3 oxides. The Co6W6C phase was detected by x-ray diffraction in the powder heated in nitrogen at 1273 K, and the phases associated with decarburization of WC, such as W2C, W3C phases, were not observed. With increasing temperature, the dissolution of W and C elements in the Co matrix led to a gradual increase in {111} crystallographic plane spacing, eventually leading to the formation of an amorphous phase.

Download Full-text

Microstructure and thermal stability of Al2O3-20vol%Fe48Co52composite powder particles prepared by high energy mechanical milling

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/4/1/012016 ◽

2009 ◽

Vol 4 ◽

pp. 012016

Author(s):

M Yusop ◽

D L Zhang ◽

M Wilson

Keyword(s):

Thermal Stability ◽

Mechanical Milling ◽

High Energy ◽

Powder Particles ◽

Thermal Stability Of

Download Full-text

Microstructures and Mechanical Properties of Nanocrystalline AZ31 Magnesium Alloy Powders with Submicron TiB2 Additions Prepared by Mechanical Milling

Crystals ◽

10.3390/cryst10060550 ◽

2020 ◽

Vol 10 (6) ◽

pp. 550

Author(s):

Haiping Zhou ◽

Chengcai Zhang ◽

Baokun Han ◽

Jianfeng Qiu ◽

Shengxue Qin ◽

...

Keyword(s):

Magnesium Alloy ◽

Mechanical Milling ◽

Boundary Segregation ◽

Milling Process ◽

Az31 Magnesium Alloy ◽

Micro Hardness ◽

Submicron Scale ◽

The Matrix ◽

Xrd Patterns ◽

Tib2 Particles

In this work, nanocrystalline AZ31 magnesium alloy powders, reinforced by submicron TiB2 particles, were prepared via mechanical milling. It was found that TiB2 particles stimulated the fracture and welding of AZ31/TiB2 powders, leading to the acceleration of the milling process. Meanwhile, the TiB2 particles were refined to submicron-scale size during the milling process, and their distribution was uniform in the Mg matrix. In addition, the matrix was significantly refined during the milling process, which was also accelerated by the TiB2 particles. The formation of grain boundary segregation layers also led to the weakened TiB2 peaks in the XRD patterns during the mechanical milling. The grain sizes of AZ31–2.5 wt % TiB2, AZ31–5 wt % TiB2 and AZ31–10 wt % TiB2 powders were refined to 53 nm, 37 nm and 23 nm, respectively, after milling for 110 h. Under the combined effect of the nanocrystalline matrix and the well-dispersed submicron TiB2 particles, the AZ31/TiB2 composites exhibited excellent micro-hardness. For the AZ31–10 wt % TiB2 composite, the micro-hardness was enhanced to 153 HV0.5.

Download Full-text