high strength nanostructured al-based alloys through optimized processing of rapidly quenched amorphous precursors
Mechanical properties of bulk samples produced by Sparks
Plasma Sintering (SPS)
At a temperature above 673 K, Dy powder passes through in-
In-situ crystal of nano-materials
Scale of intermetal compounds during SPS.
Discharge Plasma Sintering of al84 ni7co3dy6 body samples showed the compression yield strength of 1433mpa and the maximum strength of 1773 MPa, as well as 5.
Plastic strain of 6%, respectively.
The addition of Dy enhances the thermal stability of amorphous Al-medium primary fcc AlTM -RE alloy.
The crystal precipitation of intermetal compounds through the residual amorphous matrix has an important role in limiting the growth of fcc Al phase and helps to improve mechanical properties.
This completely crystalline nanoor ultrafine-scale Al-Ni-Co-
Dy systems are considered promising industrial applications because they have excellent mechanical properties in a combination of very high room temperature strength and good scalability.
Many studies have been carried out to produce alloys of light weight and high strength, with the aim of developing high-performance transportation systems and new materials for energy saving.
Especially high strength aluminum-
To reduce fuel consumption, the alloy-based automotive and aerospace industries are gradually replacing steel and cast iron to reduce the weight of vehicles.
Several methods, such as heat treatment and grain refinement, have been tried along this route to improve the strength of the aluminum alloy.
In recent years, high-strength aluminum alloy has been produced by rapid solidification, mechanical alloy or high-pressure deformation.
However, the contradiction is that the high-strength aluminum alloy produced by the above-mentioned technology is not always advantageous in engineering applications, because high-strength means difficulty in forming.
Amorphous alloys or metallic glass are known for their extremely high strength at room temperature, but interestingly, they can soften to a state of viscous liquid that is higher than the temperature of the glass transition, in which it is possible to pass throughAl-
Based on amorphous alloys have been studied because they have extraordinary weight and high strength compared to conventional Crystal Lightweight Al-
Base alloy at room temperature.
Formation of aluminum
First, the Liquid Quenching-based amorphous alloy of binary Al-is studied. M (metalloid)and Al-TM (
A system with coexistence of non-crystalline and crystalline phases.
Compared with traditional Al-alloys, base amorphous alloys have excellent mechanical properties
Based on crystal alloys, the maximum size of the product is limited to a thickness of only a few microns (
Because the glass is relatively low
In turn, the forming ability needs to have a high cooling rate when setting. Moreover, Al-
The highly localized base amorphous alloy with shear band deformation introduces catastrophic failure, which is similar to the typical features of the amorphous alloy, resulting in a small overall room temperature plasticity.
For these reasons, previously in Al-
The focus based on amorphous alloys is on how to improve the glass forming capacity and mechanical properties of amorphous alloys or bulk metal glass by processing and manufacturing routes.
Follow-up development in Al-based high-
Wang, the strength of nano-alloys.
Enhanced mechanical properties of aluminumNi-Co-
Nano Gd of amorphous alloy.
In addition, it is proposed that the introduction of additional rare metal alloy elements can promote the glass forming ability and improve the mechanical properties of metal glass. Qiao .
The alloy of Dy has an important influence on the plasticity of Cu-
Metal glass. Park .
It is shown that the addition of Y improves the mechanical properties of Cu-
By introducing chemical non-uniformity, based on metal glass. Inoue .
It has been found that in the rapidly solidified aluminum nickel, the alloy composed of the amorphous phase and the nano-Al phase exhibits superior strength to the non-crystalline single phase.
However, despite the partial or complete Nano
Crystal of aluminum
Based on the fact that the amorphous alloy exhibits an overcoming of the enhanced plasticity of the amorphous inherent brittle, the limitation of the scale does not change, resulting in a very limited size.
To overcome this disadvantage, Powder Metallurgy methods such as gas-
In order to overcome the size limit, an atomization amorphous powder was used.
These restrictions are holding Al back-
Based on non-crystal and parts (nano)-
Although the crystalline alloy has excellent mechanical properties.
In magnetic materials, Dy is a key element in maintaining the thermal stability of high performance Nd-based magnets.
In addition, the effect of each rare earth element, especially Dy, on the thermal stability of the amorphous phase and the correlation with mechanical properties during the crystalline process is still not explored.
And the effect of the synthesis route on the crystalline dynamics of the plastic obtained at such high strength
The base alloy is not clear at present.
In this study, we tried to improve the thermal stability of aluminum.
Enhanced mechanical properties based on amorphous alloys are obtained by introducing Dy
Nano-based alloys in the sintering process of amorphous precursor powder.
Along this line, we systematically studied the crystalline dynamics and phase and microstructure transformation of amorphous AlNiCoDy alloys, and associated these findings with mechanical properties and strengthening mechanisms (s)
Alloy of this model.