JPS6213419B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to amorphous alloys.

Recently, amorphous alloys have been attracting attention as new materials. Unlike conventional crystalline metal alloys, this amorphous alloy is a metal that does not have a crystal structure, and its properties are not found in conventional metal materials.
Many of them have superior heat resistance, strength, corrosion resistance, or magnetic properties. The present invention aims to provide a more excellent amorphous alloy as these alloy materials.

Generally, an alloy consisting of elements of the same group of the periodic table such as iron, cobalt, or nickel, or a mixture thereof, and a metalloid such as boron, carbon, silicon, or phosphorus is melted at a high temperature of 1000°C or higher, and the molten metal is melted. is brought into direct contact with a metal with good thermal conductivity, such as copper or iron, kept at room temperature or lower, and approximately
An amorphous state was obtained by rapid cooling at 10 ⁶ °C/sec. Amorphous alloys made by these methods have various superior properties compared to crystalline metals, such as higher strength and corrosion resistance. Furthermore, to improve these properties, elements from groups _A to _A of the periodic table, such as scandium, titanium, vanadium, chromium, manganese, yttrium, zirconium, niobium, molybdenum, technetium, hafnium, tantalum, tungsten, and rhenium, We investigated amorphous alloys containing one or more metals selected from the group consisting of lanthanum-based elements and actinium-based elements, and obtained properties that depend on each additional metal element. for example,
Amorphous alloys containing iron as the main component and chromium added have excellent strength and corrosion resistance. However, these amorphous alloys also have the following drawbacks.

The most important thing is that since it is in an amorphous metastable state, it easily crystallizes in a high-temperature atmosphere and loses the various properties that amorphous alloys have.

Accordingly, the present invention provides a more stable amorphous alloy having a variety of desirable properties.

The amorphous alloy of the present invention includes one or more metals (A) selected from the group of elements iron, cobalt, and nickel, and one or more metals selected from the group of metalloid elements boron, carbon, silicon, and phosphorus. One or more metals (C) selected from the group of the above metalloids (B), sodium, magnesium, calcium, and barium, and the group of elements titanium, zirconium, niobium, chromium, and molybdenum. It is composed of one or more metals (D).

When both constituent elements C and D are added to the constituent elements A and B, which are typical amorphous alloy forming elements, not only can the crystallization temperature of the amorphous alloy be greatly increased, but also Its strength and corrosion resistance can also be improved. The increase in crystallization temperature is
The atomic percentage of constituent element C is 0.5 to 3, although it varies depending on the above constituent elements C and D and their combination.
%, when the atomic percentage of constituent element D is within the range of 2 to 50%, the crystallization temperature will rise by about 50℃ in a good case compared to a similar amorphous alloy that does not contain both constituent elements C and D. shows. This effect is due to the simultaneous addition of C and D of the constituent elements A, B, C, and D, and when either of the constituent elements C or D is absent as a constituent, crystallization at a maximum temperature of 35°C occurs. It merely indicates an increase in temperature. Furthermore, the effect of increasing the crystal temperature due to the simultaneous addition of constituent elements C and D is 0.01 at% for constituent element C and 0.01 at% for constituent element D.
0.5 to 3 atomic% and 2 to 3 atomic%, respectively.
The effect is maximum in the 50 atomic % region, and as the concentration of the partner is further increased, the effect decreases. and,
When the constituent elements C and D are each less than 0.01 atom, when the constituent element C exceeds 6 atom%, and when the constituent element D exceeds 60 atom%, the effect of increasing the crystallization temperature is greater than that of other elements. It is about the same level or lower than that of amorphous alloys. In this way, if the constituent element C is within the range of 0.01 to 6 at%,
is in the range of 0.01 to 60 at.%, the high crystallization temperature mentioned above results.

Furthermore, by including the constituent elements C and D in the above concentration range, the strength and corrosion resistance of the amorphous alloy are improved, and the effect is similar to that seen in the increase in crystallization temperature of the constituent elements C and D. It was concentration dependent. The highest values showed an improvement of up to 10% and 40%, respectively, compared to conventional similar amorphous alloys. The above-mentioned effect was also exhibited in the AB-C-Cr system in which D=Cr, but it was particularly noticeable when Cr was in the range of more than 15 at % and less than 50 at %.

Hereinafter, the amorphous alloy of the present invention will be explained in detail with reference to Examples.

[Example 1] An alloy with the composition Fe ₄₂ Si ₈ B ₁₀ Mg ₁ Cr ₃₉ (subscripts indicate atomic percentages) consisting of iron, boron, silicon, magnesium, and chromium was made into an alloy with an outer diameter of 20 mm.
It is melted in an argon atmosphere at 1200℃ in a quartz tube with an inner diameter of molten metal,
A steel roller with a diameter of 300 mm and rotating at 200 rpm,
Contact was made immediately and allowed to cool. The sample obtained by this rapid cooling was confirmed to be amorphous as a result of X-ray diffraction measurement. Its crystallization temperature is Mg and Cr
The temperature was increased by 48℃ compared to the alloy that does not contain .

[Example 2] Composition consisting of cobalt, nickel, phosphorus, carbon, barium, calcium, titanium and molybdenum
An alloy of Co ₄₀ Ni ₄₀ P ₁₃ C ₃ Ba ₀ . ₅ Ca ₀ . ₅ Ti ₁ . ₅ Mo ₁ . ₅ (subscripts indicate atomic percentages) was melted at 1200°C, and the same method as in Example 1 was carried out. It was rapidly cooled. It was confirmed by X-ray diffraction that it was an amorphous alloy. Its crystallization temperature was 51°C higher than that of the alloy containing no Ba, Ca, Ti, or Mo.

[Example 3] Iron, nickel, boron, silicon, phosphorus, sodium,
Composition consisting of zirconium and niobium
An alloy _of Fe ₄₀ Ni ₂₀ B ₁₀ Si ₈ P ₂ Na _0.5 Zr ₁₀ Nb _9.5 (subscripts indicate atomic percentages ₎ was melted at 1250° C. and rapidly cooled in the same manner as in Example 1. It was confirmed by X-ray diffraction that it was amorphous. Its crystallization temperature is 50℃ compared to alloys that do not contain Na, Zr, and Nb.
It was elevated.

The amorphous alloy thus produced consists of one or more metal C selected from the group of elements sodium, magnesium, calcium, and barium and a group of elements titanium, zirconium, niobium, chromium, and molybdenum. Compared to an amorphous alloy of similar composition that does not simultaneously contain one or more metal D elements selected from effective. Furthermore, improvements in strength and corrosion resistance were observed by 0 to 10% and 15 to 40%, respectively. However, the strength is the breaking strength, and the corrosion resistance was determined by immersing a sample in a 1N NaCl aqueous solution and measuring its weight.

Such an effect is caused by one or more of the metal elements iron, cobalt, and nickel (A), one or more of the metalloid elements boron, carbon, silicon, and phosphorus (B), and at least one of the metalloid elements of sodium, magnesium, and barium. one or more metals
All of these are observed in amorphous alloys containing (C) and at least one metal (D) selected from titanium, zirconium, niobium, chromium, and molybdenum.

Furthermore, when the composition of constituent elements A, B, C, and D is within the range of 33 to 93 atomic%, 6 to 35 atomic%, 0.01 to 6 atomic%, and 0.01 to 60 atomic%, respectively, the above-mentioned effects are particularly obtained. Remarkably, amorphousization with these compositions was also easy if the compositions were appropriately selected.

Claims (1)

[Claims] It is expressed by the formula 1 A _x B _y C _z D _v , where A is one selected from the group of elements Fe (iron), Co (cobalt), and Ni (nickel). one or more metals, B is one or more metalloids selected from the group of metalloid elements Si (silicon), B (boron), P (phosphorus), C (carbon), C is one or more metals selected from the group of elements Na (sodium), Mg (magnesium), Ca (calcium), Ba (barium), D is Ti (titanium), Zr
One or more metals selected from the group of elements (zirconium), Nb (niobium), and Mo (molybdenum), where x, y, z, and v are respectively A and
Indicates the atomic percentage of B, C, D, 33x93,6
A heat-resistant amorphous alloy characterized by y35, 0.01z6, 15∠v60 (where x+y+z+v=100). 2 A _x B _y C _z C _rv , where A is one or more selected from the group of elements Fe (iron), Co (cobalt), and Ni (nickel). metal, B is one or more metalloids selected from the group of metalloid elements Si (silicon), B (boron), P (phosphorous), C (carbon); C is Na (sodium); One or more metals selected from the group of elements Mg (magnesium), Ca (calcium), Ba (barium), x, y, z,
v indicates the atomic percentage of A, B, C, Cr, respectively, 33x93, 6y35, 0.01z6, 15
∠v60 (where x+y+z+v=
100) Amorphous alloy with heat resistance.