Effects of aging treatment on the precipitation behaviors and mechanical properties of Al-5.0Mg-3.0Zn-1.0Cu cast alloys

2020 ◽  
Vol 842 ◽  
pp. 155707
Author(s):  
Hua-Ping Tang ◽  
Qu-Dong Wang ◽  
Colin Luo ◽  
Chuan Lei ◽  
Tian-Wen Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aging Treatment ◽  
Cast Alloys ◽  
Effects Of Aging

scholarly journals The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1256
Author(s):  
Di Tie ◽  
Yi Jiang ◽  
Renguo Guan ◽  
Minfang Chen ◽  
Jufu Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Behavior ◽  
Aging Treatment ◽  
Industrial Applications ◽  
Az91 Alloy ◽  
Refined Microstructure ◽  
Lanthanum Content ◽  
Cast Alloys ◽  
Evolution Of Microstructure ◽  
Strength And Ductility

AZ91 alloy is a widely applied commercial magnesium alloy due to its good castability, balanced mechanical properties and acceptable price, and lanthanum alloying has been proven to be one of the most effective methods to further improve its mechanical properties. Therefore, we reveal the evolution of microstructure, mechanical properties and fracture behavior with increasing lanthanum content in AZ91 alloy in this study. The magnesium matrix was significantly refined by lanthanum content, and this effect became more evident with increasing addition of lanthanum. The presence of Al3La precipitates significantly reduced the grain mobility and suppressed the formation of Mg17Al12 discontinuous precipitates along the grain boundaries. The rheo-cast alloys exhibited improved and balanced tensile strength and ductility after aging treatment. The fracture type of AZ91-La alloys could be classified as ductile fracture due to the presence of less quasi-cleavage planes and more dimples with a mixture of tear ridges and micropores. Due to the fully refined microstructure and the balanced mechanical properties, the AZ91–1.0La (mass%) alloy presented the greatest potential for industrial applications among the three studied AZ91-La alloys.

Effect of Rare Earth Er on the Microstructure and Mechanical Properties of High Temperature Titanium Alloys

2017 ◽  
Vol 898 ◽  
pp. 586-591
Author(s):  
Bo Long Li ◽  
Tong Bo Wang ◽  
Peng Han ◽  
Zhen Qiang Wang ◽  
Zuo Ren Nie
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
High Temperature ◽  
Titanium Alloys ◽  
Aging Treatment ◽  
Thermal Exposure ◽  
Second Phase ◽  
Creep Properties ◽  
Cast Alloys ◽  
Mean Size

The microstructures and mechanical properties of the high temperature titanium alloys containing Er, i.e. Ti-6Al-2.5Sn-4Zr-0.3Mo-1Nb-0.35Si-xEr (x=0, 0.1, 0.3wt%), were investigated. Both the grain size and lamellar structure inside grains were significantly refined with the addition of Er in as-cast alloys. Lamellar and duplex microstructures were obtained after forging and heat treatment. Silicide precipitates were generated in the boundary of lamellar α phase after aging treatment. Meanwhile, a few α2 phase were precipitated in the alloys after aging treatment. After 600°C /100h thermal exposure, the α2 phases with a mean size of 7nm and spacing of 10 nm were precipitated homogeneously in α lamellar. The creep properties were significantly improved by the addition of rare earth Er due to the formation of the second phase containing Er, silicide and α2 phase.

Effect of Aging Treatment on the Thermal Stability and Properties of Cu-10Fe-3Ag In Situ Composites

2011 ◽  
Vol 366 ◽  
pp. 343-346 ◽  
Author(s):  
Yong Li ◽  
Rui Qing Liu ◽  
Fang Xu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Ductile Rupture ◽  
In Situ Composite ◽  
Microstructure And Mechanical Properties ◽  
Effects Of Aging ◽  
Thermal Stability Of

The effects of aging treatment on the microstructure and mechanical properties of Cu-10Fe-3Ag in-situ composite were investigated. And the mechanism of Ag element was analyzed during aging treatment. The results show that: presence of Ag can accelerate γ-Fe precipitation from in the Cu matrix, but also reduces the thermal stability of Fe fibers. As the aging temperature increasing, the hardness and conductivity of Cu-10Fe-3Ag in-situ composite increase at first and then decrease. The conductivity of Cu-10Fe-3Ag in-situ composite can reach 58.4% IACS when aging for 6h at 475 °C. The Fractures of the alloy are all ductile rupture and the dimples are smaller with the aging temperature increasing.

scholarly journals Effects of Aging Treatment on Laser-Welded Mg-Rare Earth Alloy NZ30K

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Dai ◽  
Li Yang ◽  
Lili Li ◽  
Guolin Guo ◽  
Lanzhong Guo
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Rare Earth ◽  
Supersaturated Solid Solution ◽  
Aging Treatment ◽  
Precipitation Sequence ◽  
Rare Earth Alloys ◽  
Rare Earth Alloy ◽  
Transmission Electron ◽  
Effects Of Aging

Magnesium-rare earth alloys have received extensive attention due to their attractive mechanical properties resulting from high density of precipitation. The precipitation sequence in laser-welded Mg-3Nd-0.2Zn-0.4Zr (NZ30K) alloy during aging treatment at 200°C and 225°C has been investigated using transmission electron microscopy (TEM). The results indicate that the tensile strength of laser-welded NZ30K can be improved significantly after aging treatment at 200°C for 8 h. It is found that the precipitation in laser-welded NZ30K alloy follows the sequence of supersaturated solid solution → β′′(DO19) → β′(fcc).

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