Gadolinium-base block amorphous alloy and its preparing method
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A technology of amorphous alloys and bulk, applied in the field of alloys, can solve the problems of rare earth-based amorphous alloy preparation and performance research, etc., and achieve the effects of low cost, simple preparation, and rich rare earth resources
Inactive Publication Date: 2007-01-10
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
At present, people are constantly looking for a new system of amorphous alloys with high glass-forming ability, but there are not many studies on the preparation and properties of rare earth-based amorphous alloys, especially heavy rare earth amorphous alloys.
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Embodiment 1
[0030] Embodiment 1, Gd 60 Cu 20 al 10 Ni 10 Preparation of Bulk Amorphous Alloy
[0031] Gd, Cu, Al and Ni with a molar ratio of 60:20:10:10 are used to prepare gadolinium-based bulk amorphous alloys with a purity of more than 99.9%. Melt in an electric arc furnace with an argon atmosphere, mix evenly, and obtain a master alloy ingot of Gd-Cu-Al-Ni quaternary alloy after cooling; then use a conventional metal mold casting method to remelt the ingot and use the The suction casting device, the master alloy melt is sucked into the water-cooled copper mold, and the composition is Gd 60 Cu 20 al 10 Ni 10 , a bulk amorphous alloy with a diameter of 1.5mm.
[0032] Such as figure 1 X-ray diffraction (XRD) shown proves that the alloy is completely amorphous. Such as figure 2 The thermal analysis (DSC) diagram shown, its glass transition temperature (T g ), crystallization onset temperature (T x ), the width of the subcooling interval (ΔT=T x -T g ) are 481K, 514K and ...
Embodiment 2～19
[0034] Various ratios of gadolinium-based bulk amorphous alloys were prepared according to the method of Example 1, and their compositions and thermophysical parameters are listed in Table 1.
[0035] Reality
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example
alloy composition
T g
(K)
T x
(K)
ΔT
(K)
T m
(K)
T l
(K)
T rg
gamma
1
Gd 60 Cu 20 al 10 Ni 10
481
514
33
880
925
0.55
0.366
2
Gd 60 Cu 10 Al 10 Ni 10 Fe 10
498
538
39
897
931
0.567
0.340
3
Gd 60 Cu 15 Al 5 Ni 10 Fe 10
520
557
37
910
945
0.571
0.380
4
Gd 60 al 15 Ni 15 Cu 10
477
516
39
871
913
0.547
0.371
5
Gd 65 al 10 Ni 10 Cu 10 Nb 5
488
523
35 ...
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Abstract
This invention refers to a kind of Gd big amorphous alloy, whose main component is Gd. It also contains at least 50% by volume of amorphous phase, and its composition can be indicated by the formula below: GdaAlbNicCudMe. (50<=a<=80, 5<=b<=20, 5<=c<=20, 5<=d<=20, 0<=e<=15, a+b+c+d+e=100). The transitional subgroup metal element M said above is Sc, Nb, Ti, Cr, Mn, Fe, Co, Y, La, Pr, Nd or Hf. The alloy is made in arc furnace of argon atmosphere, and the argon is adsorbed by Ti. The components said above are melted in the arc furnace to get mother alloy cast ingot. Then the conventional metal casting method is used to molt the mother alloy cast ingot. After that, we use the inspiring-and-casting device in the arc furnace to inspire the bath into the water-cooling copper mould. At last, the alloy comes out. This alloy has the strong ability to suppress crystallization, so it is easy to form big amorphous alloy. Besides, it is easy to make and costs little. Also, the alloy has good magnetic performance and magneto-optic performance, so it can be used as function material.
Description
technical field [0001] The invention relates to an alloy, in particular to a gadolinium-based bulk amorphous alloy with heavy rare earth element gadolinium as the main component, an appropriate amount of alloying elements added, and at least 50% of the amorphous phase (volume percentage) . Background technique [0002] Typically, metals or alloys crystallize to form crystals when cooled from a liquid state. It has been found that certain metals or alloys cool at a sufficiently fast rate, for example 10 per second 4 ~10 6 In the order of K, it will maintain an extremely viscous state when it is solidified, thereby inhibiting crystallization and obtaining an amorphous metal or alloy. [0003] However, in order to obtain such a high cooling rate, the molten metal or alloy can only be sprayed onto a conductive substrate with very good thermal conductivity, and the size of the obtained amorphous metal or alloy is very small. For example, the molten alloy is sprayed onto a hig...
Claims
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