US20250207227A1 - Alloy, alloy member and product - Google Patents

Alloy, alloy member and product Download PDF

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Publication number
US20250207227A1
US20250207227A1 US18/729,694 US202318729694A US2025207227A1 US 20250207227 A1 US20250207227 A1 US 20250207227A1 US 202318729694 A US202318729694 A US 202318729694A US 2025207227 A1 US2025207227 A1 US 2025207227A1
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United States
Prior art keywords
alloy
magnesium
energy
less
lattice mismatch
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Pending
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US18/729,694
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English (en)
Inventor
Tomio Iwasaki
Hiroki SUGAWARA
Hiroshi Ohnuma
Shuho KOSEKI
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Proterial Ltd
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Proterial Ltd
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Assigned to PROTERIAL, LTD. reassignment PROTERIAL, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWASAKI, TOMIO, KOSEKI, Shuho, OHNUMA, HIROSHI, SUGAWARA, HIROKI
Publication of US20250207227A1 publication Critical patent/US20250207227A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials

Definitions

  • the present invention relates to an alloy that is either in a molten state or in a plastic state, more particularly to an alloy that is resistant to magnesium alloys, and to an alloy member and a product using the same.
  • JIS SKD61 For molds to be used for die-casting etc. of magnesium alloys, JIS SKD61 has been used, for example. If the same mold is repeatedly used for casting, the mold may get damaged. One of the main causes of the damage is erosion. Erosion is said to occur when a part of the mold being in contact with molten magnesium alloy turns into an alloy, thereby having a lower melting point.
  • Patent Document 2 discloses an HEA formed of multiple components including, in addition to titanium, zirconium, niobium, and tantalum, at least one selected from a group consisting of molybdenum, hafnium, tungsten, vanadium, and chromium.
  • the HEA disclosed in Patent Document 2 is to be used as a metal material for organisms.
  • Non-Patent Documents 1 to 6 disclose technical documents that are necessary to provide supplementary descriptions of embodiments of the present invention.
  • Non-Patent Document 1 describes a method for simulating a process of atomic movements based on a basic equation of quantum mechanics, i.e. the calculation principle of the first principle molecular dynamics method. Since electrons and nuclei forming atoms of a material follow the rules of quantum mechanics, such the simulation can evaluate properties of the material.
  • Non-Patent Document 2 mentions a method for calculating a diffusion coefficient by molecular dynamics simulation.
  • Non-Patent Document 3 mentions a method for calculating adsorption energy by molecular dynamics simulation. Remaining Non-Patent Documents 4 to 6 will be mentioned below in sections describing the embodiments of the present invention.
  • a first aspect of the present invention is an alloy including, as a first element group, 10 at % or more and 45 at % or less each of Fe, Cr, and V, in which a Mg lattice mismatch is 13% or more and dislocation movement barrier energy is 300 kJ/mol or more.
  • the alloy may further include, as a second element group, 10 at % or more and 25 at % or less each of one or more types of element selected from a group consisting of Mn, Co, Ni, Si, Ge, Ru, and Pd.
  • Mg adsorption energy is 0.2 J/m 2 or less.
  • the lattice mismatch with magnesium is large, and thus the alloy has an excellent erosion resistance to magnesium.
  • the dislocation movement barrier energy is higher than a prescribed value, the alloy having sufficient rigidity can be obtained.
  • a second aspect of the present invention is an alloy member including at least partly an alloy including, as a first element group, 10 at % or more and 45 at % or less each of Fe, Cr, and V with remainder made up of unavoidable impurities, in which a Mg lattice mismatch is 13% or more and dislocation movement barrier energy is 300 kJ/mol or more.
  • the alloy may further include, as a second element group, 10 at % or more and 25 at % or less each of one or more types of element selected from a group consisting of Mn, Co, Ni, Si, Ge, Ru and Pd.
  • Mg adsorption energy of the alloy is 0.2 J/m 2 or less.
  • the lattice mismatch with magnesium is large, and thus the alloy member has an excellent erosion resistance to magnesium.
  • the dislocation movement barrier energy is higher than a prescribed value, the alloy member having sufficient rigidity can be obtained.
  • the above effects can be obtained with more certainty when the magnesium adsorption energy is 0.2 J/m 2 or less.
  • a third aspect of the present invention is a product including at least partly the alloy member according to the second aspect of the present invention.
  • the product is a metal mold for processing magnesium.
  • the product having an excellent erosion resistance to magnesium and sufficient rigidity can be obtained. More particularly, a metal mold for processing magnesium in which erosion can be prevented in magnesium casting etc. can be obtained.
  • the present invention can provide a multicomponent alloy, and an alloy member and a product using the alloy member, in which the alloy is resistant to magnesium, especially having resistance to erosion and mechanical strength, during processes such as casting of magnesium alloys.
  • FIG. 1 is a profile of adsorption energy versus a short-side lattice mismatch with Mg.
  • FIG. 2 is a graph showing Rockwell hardness (HRC) of samples.
  • FIG. 3 shows a structural photograph and element mappings of Sample No. 2.
  • the embodiment is to hardly react with magnesium alloys in a molten state, for example.
  • it is important to make sure that magnesium adsorption is difficult (magnesium can hardly approach) and magnesium intrusion is difficult (magnesium can hardly spread from surfaces).
  • Difficulty of magnesium adsorption is expressed as how low adsorption energy (may also be referred to as detachment energy), such as the one disclosed in Non-Patent Document 5, is: the lower the adsorption energy is, the harder the adsorption becomes.
  • the adsorption energy is found by calculation, and a method for the calculation will be described below.
  • Dominant factors of the adsorption energy are lattice constants and a lattice mismatch, which is a relative difference between the lattice constants, as shown in Non-Patent Document 6, for example. That is, the lattice constants and the lattice mismatch, which is the relative difference between the lattice constants, are more dominant factors than other factors such as surface energy, cohesive energy, and electronegativity.
  • the inventor of the present invention has paid attention to the lattice mismatch, which is the relative difference between the lattice constants, and then has found out that, by using a material having the large lattice mismatch with magnesium, it is possible to obtain magnesium resistance, especially an excellent erosion resistant property.
  • the lattice mismatch is sometimes referred to as lattice inconsistency and can be found by calculation. A method of the calculation will be described below.
  • Non-Patent Document 5 describes bonding strength such as interface strength between a wiring film and a barrier film of an electron component, in which an attempt to reduce the lattice mismatch as much as possible, ideally to zero, has been made. Contrary to the above, the present invention aims to obtain magnesium resistance, i.e. non-reactiveness to molten magnesium, by increasing the lattice mismatch, which is an idea opposite to the conventional one.
  • the molten magnesium does not intrude from surfaces and react with the alloy. Difficulty of magnesium intrusion is evaluated by a diffusion coefficient from the surface to the inside. Results of a study on relationships between the lattice mismatch and the magnesium diffusion coefficients of some alloys show that the larger the lattice mismatch is, the more the adsorption energy and the magnesium diffusion coefficients (hereafter, may be simply referred to as diffusion coefficients) can be suppressed.
  • the magnesium diffusion coefficient can be found by calculation, and a method for the calculation will be described below.
  • the alloy hardly deforms and thus the alloy hardly fractures.
  • mechanical strength is preferably high.
  • deformation of a metal such as an alloy is expressed by dislocation movement; and how hard it is to deform, i.e. the mechanical strength of the metal, is expressed by how hard the dislocation movement is. That is, as shown in Non-Patent Document 4, for example, the mechanical strength of a metal is represented by dislocation movement barrier energy, and the higher the dislocation movement barrier energy required for dislocation movement is, the more difficult the deformation is and the higher the mechanical strength is.
  • the dislocation movement barrier energy has also been paid attention to. Details of a method of calculation of the dislocation movement barrier energy etc. will be described below.
  • FIG. 1 is a profile showing a relation between a lattice mismatch with magnesium (hereafter, simply referred to as the lattice mismatch) and magnesium adsorption energy (hereafter, simply referred to as adsorption energy) of several different metal elements.
  • FIG. 1 shows that if the lattice mismatch increases, the adsorption energy decreases. In particular, if the lattice mismatch is 13% or more, the adsorption energy is sufficiently low without much further decline. Thus, the lattice mismatch is preferably 13% or more.
  • the alloy according to the present embodiment includes, as a first element group, Fe, Cr, and V. Also, as a second element group, the alloy may further include one or more types selected from a group consisting of Mn, Co, Ni, Si, Ge, Ru, and Pd. When a total is 100 at % (the same applies hereafter), an amount of each of the elements included in the first element group is 10 at % or more and 45 at % or less (at %:element ratio; hereafter, written as 10-45 at %). Also, if the second element group is included, an amount of each element included in the second element group is 10-25 at %.
  • the alloy is to be used as a mold, thermal conductivity of the alloy is preferably high to obtain a sufficient cooling speed with certainty.
  • B may be added such that an element ratio thereof is 1-60 at %, preferably 10-45 at %, or more preferably 14-40 at %. Also, it is preferable that B is included 1.5 times, or more preferably 2 times or more, an amount of each element of the first element group or the first and second element groups.
  • the ranges of the element ratios of the first and second element groups are acknowledged as content amounts of elements constituting a high entropy alloy. If the second element group is not included, it is more preferable that each element of the first element group is included at 25-45 at %. Also, the element ratios of all the elements constituting the alloy may be equal.
  • the alloy according to the present embodiment may include, other than the first and second element groups, unavoidable impurities as remainder. For example, 500 ppm or less each of unavoidable impurity elements such as C, N, and O may be included.
  • the high entropy alloy in the present description is meant to have a maximum of 45 at % or less, or more preferably a maximum of 34 at % or less, of each element.
  • the alloy according to the present embodiment has the small adsorption energy and the small diffusion coefficient to prevent reacting with magnesium approaching surfaces thereof or even intruding therein. For this reason, the lattice mismatch with Mg is to be 13% or more.
  • Hardness of the alloy according to the present embodiment at a normal temperature is preferably 430 or higher in terms of Vickers hardness (HV). Hardness is one of indicators that show the mechanical strength of the alloy according to the present embodiment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US18/729,694 2022-01-24 2023-01-24 Alloy, alloy member and product Pending US20250207227A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2022008438 2022-01-24
JP2022-008438 2022-01-24
PCT/JP2023/002126 WO2023140388A1 (ja) 2022-01-24 2023-01-24 合金、合金部材および製造物

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EP (1) EP4446449A4 (https=)
JP (1) JPWO2023140388A1 (https=)
WO (1) WO2023140388A1 (https=)

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Publication number Priority date Publication date Assignee Title
AT386612B (de) 1987-01-28 1988-09-26 Plansee Metallwerk Kriechfeste legierung aus hochschmelzendem metall und verfahren zu ihrer herstellung
US20020159914A1 (en) * 2000-11-07 2002-10-31 Jien-Wei Yeh High-entropy multielement alloys
JP2006144098A (ja) * 2004-11-24 2006-06-08 Nachi Fujikoshi Corp マグネシウム合金の射出成形機部品用材料
JP2007063576A (ja) * 2005-08-29 2007-03-15 Hitachi Metals Ltd 非鉄溶融金属用合金
US20110293742A1 (en) * 2010-06-01 2011-12-01 Industrial Technology Research Institute Antibacterial alloy coating composition
KR101888299B1 (ko) * 2016-03-21 2018-08-16 포항공과대학교 산학협력단 극저온용 고 엔트로피 합금
JP6979184B2 (ja) 2016-10-28 2021-12-08 国立大学法人大阪大学 多成分系からなる合金
KR20190009229A (ko) * 2017-07-18 2019-01-28 포항공과대학교 산학협력단 변태유기소성 고엔트로피 합금 및 이의 제조방법
EP3543368B1 (fr) * 2018-03-20 2020-08-05 The Swatch Group Research and Development Ltd Alliages à haute entropie pour composants d'habillage
CN111074133A (zh) * 2020-01-07 2020-04-28 北京大学 一种低活化多主元固溶体合金及其制备方法
CN111411286B (zh) * 2020-05-13 2021-03-30 南京工程学院 一种Laves相和Sigma相协同弥散强化的高熵合金涂层及其制备方法和应用
CN111364040B (zh) * 2020-05-13 2022-04-05 南京工程学院 一种高硬度高熵合金涂层及其制备方法和应用
CN113528985B (zh) * 2021-07-30 2022-05-24 西安工业大学 一种微合金化的脆性耐蚀高熵非晶合金及其制备方法
CN114351028B (zh) * 2021-12-03 2023-01-24 核工业西南物理研究院 一种(FeVCrMn)xTiy低活化高熵合金及其制备方法

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EP4446449A4 (en) 2025-10-22
JPWO2023140388A1 (https=) 2023-07-27
WO2023140388A1 (ja) 2023-07-27

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