JPH07278707A - Zinc alloy - Google Patents

Abstract

PURPOSE:To produce a zinc alloy having desired mechanical properties by preparing a zinc alloy having a compsn. contg. specified ratios of one or more kinds among Li, Be, Na, Mg, Al, Si, K, Ca, Ti, V, Mn, Fe, Co, Ni, Cu, Cd, In, Sn and Sb and satisfying specified conditions. CONSTITUTION:A zinc alloy having a compsn. contg., one ore more kinds among by weight, <=0.1%Li, <=0.1% Be, <=0.1% Na, <=0.1% Mg, <=0.1% Al, <=0.1% Si, <=0.1% K, <=0.1% Ca, <=0.1% Ti, <=0.1% V, <=0.1% Mn, <=0.1% Fe <=0.1% Co, <=0.1% Ni, <=15% Cu, <=1% Cd, <=1% In, <=1% Sn and <=1% Sb, and in which the S orbit energy levels (Mk) calculated by a molecular orbital method as for zinc and each alloy element, the molar fraction of each alloy element and prescribed mechanical properties Mp of the alloy satisfy prescribed calibration curves is prepd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a zinc alloy having predetermined mechanical properties, and more particularly to a zinc alloy having a predetermined tensile strength, compression strength or Brinell hardness.

[0002]

2. Description of the Related Art Zinc alloys are mainly used for die casting products, and mechanical properties such as tensile strength, compression strength and Brinell hardness required for zinc alloys differ depending on the use of the die casting products. Conventionally, various zinc alloys are known, and there is no problem if there is a zinc alloy having desired mechanical properties among known zinc alloys, but when a zinc alloy having desired mechanical properties is newly developed. Used a so-called trial-and-error method in which the effect of each alloying element on various properties of a zinc alloy was obtained from trial experiments and the optimum alloy composition was determined based on these data.

[0003]

However, according to the conventional trial-and-error method, the development of a zinc alloy having desired properties requires a great deal of cost, time and labor, and is extremely inefficient. However, it is extremely difficult to carry out such a method for a multi-component zinc alloy that has not been used in particular.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a zinc alloy whose zinc alloy composition can be easily determined from desired mechanical properties. To do.

[0005]

Means for Solving the Problems The present inventors have conducted various studies to solve the above-mentioned problems, and in order to evaluate various properties of zinc alloys, the electronic structure of zinc alloys was analyzed by a molecular orbital calculation method (DV- Xα cluster method). This calculation method is described in detail, for example, in "Introduction to Quantum Material Chemistry" by Hirohiko Adachi (Sankyo Publishing, 1991). By using the s-orbital energy level (hereinafter referred to as Mk) of the alloying element M in the mother metal zinc, which is the parameter obtained from this calculation, a calibration curve of the mechanical properties of the zinc alloy can be obtained, which gives the zinc The inventors have found that the mechanical properties of alloys can be evaluated, and have reached the present invention.

In the present invention, Mk was calculated by molecular orbital calculation using the zinc cluster model shown in FIG.
The calculated value was as shown in Table 1. In zinc alloys, the maximum amount of each alloying element that can be added is the solid solubility,
Limited by the crystallization of brittle intermetallic compounds and the possibility of alloy melting. The maximum addition amount is also shown in Table 1.

[0007]

[Table 1]

Using the above Mk values, composition averaging according to the alloy composition is performed by the following formula: ΔMk = Σ | Mk _i −Mk _Zn | × X _{i In the} formula, Mk _i is the Mk value of the i element, Mk _Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element. This ΔMk value correlates with mechanical properties such as tensile strength, compression strength and Brinell hardness of the zinc alloy. Therefore, a calibration curve can be obtained from the correlation between the ΔMk value and mechanical properties of the zinc alloy. Then, by using this calibration curve, the alloy composition having desired mechanical properties can be easily determined. On the contrary, the mechanical characteristics of the zinc alloy can be obtained from the alloy composition by using this calibration curve.

Zn-Al, which is the general composition of zinc alloys
-Cu-Mg for various alloys ΔMk = Σ | Mk _i
−Mk _Zn | × X _i was calculated. In this case, ΔMk is represented by the formula ΔMk = | Mk _Al −Mk _Zn | × X _Al + | Mk _Cu −Mk _Zn
It was calculated by | × X _Cu + | Mk _Mg −Mk _Zn | × X _Mg . Correlations between the ΔMk value and the tensile strength, compression strength or Brinell hardness of the zinc alloy were as shown in FIGS. 2, 3 and 4, respectively. 2 and 3
4 and the calibration curve is obtained from FIG. 4, and considering the correlation coefficient, the tensile strength Ts (MPa) of the zinc alloy is expressed by the formula Ts = a + bΣ | Mk _i −Mk _Zn | × X _i (where, a is 130 to 155, preferably 135-15
A value in the range of 0, b is 1270, Mk _i is the Mk value of the i element, Mk _Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element). And the compressive strength Cy (MPa) of the zinc alloy is expressed by the formula Cy = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is 140 to 165, preferably 145 to 16).
A value in the range of 0, b is 1120, Mk _i is the Mk value of the i element, Mk _Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element). And the Brinell hardness Bh (HB) of the zinc alloy is expressed by the formula Bh = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is 62 to 74, preferably 63 to 72). Value, b is 260, Mk _i is M of i element
k value, Mk _Zn is the Mk value of the Zn element, and X
_i is the mole fraction of the element _i ). An alloy composition having desired mechanical properties can be easily determined from these calibration curves.

Accordingly, a zinc alloy having the desired mechanical properties of the present invention comprises 0.1 wt% or less Li, 0.1 wt% or less Be, 0.1 wt% or less Na, 0.1 wt%. Mg below, Al less than 25 wt%, S less than 0.1 wt%
i, K of 0.1% by weight or less, Ca of 0.1% by weight or less,
0.1% by weight or less of Ti, 0.1% by weight or less of V, 0.
1% by weight or less of Mn, 0.1% by weight or less of Fe, 0.1
Wt% or less Co, 0.1 wt% or less Ni, 15 wt% or less Cu, 1 wt% or less Cd, 1 wt% or less I
n containing at least one alloying element selected from the group consisting of 1% by weight or less of Sn and 1% by weight or less of Sb, and s calculated by the molecular orbital method for zinc and each alloying element
It is characterized in that the orbital energy level Mk, the mole fraction of each alloying element, and the predetermined mechanical characteristic Mp of the alloy satisfy a predetermined calibration curve.

The zinc alloy of the present invention is specifically
The s-orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, containing at least one alloying element selected from the group consisting of the above alloying elements, the mole fraction of each alloying element, and the tensile strength of the alloy. Ts (MPa) Togashiki _{Ts = a + bΣ | Mk i} -Mk Zn | in × X _i (wherein, a is a value in the range of one hundred thirty to one hundred fifty-five, b is 1270, Mk _i is Mk of i elements Value, Mk
_Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element), and a zinc alloy having a desired tensile strength is selected from the group consisting of the above alloy elements. And at least one type of alloying element, zinc s orbital energy level Mk calculated by the molecular orbital method for each alloying element, the mole fraction of each alloying element, and the compressive strength Cy (MPa) of the alloy are expressed as Cy = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is a value within the range of 140 to 165, b is 1120, Mk _i is the Mk value of the i element, and Mk is
_Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element). Zinc alloy having a desired compressive strength, or a group consisting of the above alloy elements. Of at least one alloying element, the s-orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, the mole fraction of each alloying element, and the Brinell hardness Bh (HB) of the alloy are expressed by the formula Bh = A + bΣ | Mk _i −Mk _Zn | × X _i (where a is a value within the range of 62 to 74, and b is 26
0, Mk _i is the Mk value of the i element, and Mk _Zn is Z
a zinc alloy having a desired Brinell hardness, which is a Mk value of an n element and X _i is a mole fraction of the i element.

[0012]

【Example】

Example 1 In order to obtain an alloy having mechanical properties of a zinc alloy having a tensile strength of about 350 MPa, a compressive proof strength of about 340 MPa, and a Brinell hardness of about 110 HB, an alloy composition of Zn-10% was obtained from a calibration curve of tensile strength, compressive proof strength and Brinell hardness. Al-1
A zinc alloy of 0% Cu-0.02% Mg was prepared.
The measured and calculated tensile strength, compressive strength and Brinell hardness for this zinc alloy were as follows: Example 2 In order to obtain an alloy having mechanical properties of a zinc alloy having a tensile strength of about 320 MPa, a compressive proof strength of about 310 MPa, and a Brinell hardness of about 100 HB, an alloy composition of Zn-27% was obtained from a calibration curve of tensile strength, compressive proof strength and Brinell hardness. Al-
A zinc alloy was prepared that was 2.5% Cu-0.02% Mg. The measured and calculated tensile strength, compressive strength and Brinell hardness for this zinc alloy were as follows:

[0013]

EFFECTS OF THE INVENTION The zinc alloy of the present invention can easily determine the alloy composition from the desired mechanical properties by using a calibration curve, which greatly simplifies the development of new alloys and also makes it possible to meet a variety of user needs. Can be dealt with quickly.

[Brief description of drawings]

FIG. 1 shows a zinc cluster model used for calculating Mk by molecular orbital calculation in the present invention.

FIG. 2 is a tensile strength calibration curve graph showing the correlation between ΔMk value and tensile strength.

FIG. 3 is a compression strength calibration curve graph showing the correlation between the ΔMk value and the compression strength.

FIG. 4 is a Brinell hardness calibration curve graph showing a correlation between ΔMk value and Brinell hardness.

Claims (4)

[Claims] 1. Li less than 0.1% by weight, 0.1% by weight
The following Be, 0.1 wt% or less Na, 0.1 wt% or less Mg, 25 wt% or less Al, 0.1 wt% or less Si, 0.1 wt% or less K, 0.1 C by weight or less
a, 0.1% by weight or less of Ti, 0.1% by weight or less of V,
0.1% by weight or less of Mn, 0.1% by weight or less of Fe,
0.1% by weight or less of Co, 0.1% by weight or less of Ni, 1
5 wt% or less Cu, 1 wt% or less Cd, 1 wt% or less In, 1 wt% or less Sn and 1 wt% or less Sb
S orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, containing at least one alloying element selected from the group consisting of Satisfying a predetermined calibration curve, zinc alloy having desired mechanical properties. 2. Li less than 0.1% by weight, 0.1% by weight
The following Be, 0.1 wt% or less Na, 0.1 wt% or less Mg, 25 wt% or less Al, 0.1 wt% or less Si, 0.1 wt% or less K, 0.1 C by weight or less
a, 0.1% by weight or less of Ti, 0.1% by weight or less of V,
0.1% by weight or less of Mn, 0.1% by weight or less of Fe,
0.1% by weight or less of Co, 0.1% by weight or less of Ni, 1
5 wt% or less Cu, 1 wt% or less Cd, 1 wt% or less In, 1 wt% or less Sn and 1 wt% or less Sb
S orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, containing at least one alloying element selected from the group consisting of, and the mole fraction of each alloying element and the tensile strength Ts (MPa) of the alloy. And Ts = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is a value within the range of 130 to 155, b is 1270, Mk _i is the Mk value of the i element, and Mk
_Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element.) A zinc alloy having a desired tensile strength. 3. Li less than 0.1% by weight, 0.1% by weight
The following Be, 0.1 wt% or less Na, 0.1 wt% or less Mg, 25 wt% or less Al, 0.1 wt% or less Si, 0.1 wt% or less K, 0.1 C by weight or less
a, 0.1% by weight or less of Ti, 0.1% by weight or less of V,
0.1% by weight or less of Mn, 0.1% by weight or less of Fe,
0.1% by weight or less of Co, 0.1% by weight or less of Ni, 1
5 wt% or less Cu, 1 wt% or less Cd, 1 wt% or less In, 1 wt% or less Sn and 1 wt% or less Sb
S-orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, containing at least one alloying element selected from the group consisting of, and the mole fraction of each alloying element and the compressive strength Cy (MPa) of the alloy. And Cy = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is a value within the range of 140 to 165, b is 1120, Mk _i is the Mk value of the i element, and Mk
_Zn is the Mk value of the Zn element, and X _i is the mole fraction of the i element.) A zinc alloy having a desired compression strength. 4. Li less than 0.1% by weight, 0.1% by weight
The following Be, 0.1 wt% or less Na, 0.1 wt% or less Mg, 25 wt% or less Al, 0.1 wt% or less Si, 0.1 wt% or less K, 0.1 C by weight or less
a, 0.1% by weight or less of Ti, 0.1% by weight or less of V,
0.1% by weight or less of Mn, 0.1% by weight or less of Fe,
0.1% by weight or less of Co, 0.1% by weight or less of Ni, 1
5 wt% or less Cu, 1 wt% or less Cd, 1 wt% or less In, 1 wt% or less Sn and 1 wt% or less Sb
The s-orbital energy level Mk calculated by the molecular orbital method for zinc and each alloying element, containing at least one alloying element selected from the group consisting of, and the mole fraction of each alloying element and the Brinell hardness of the alloy Bh (HB ) And the formula Bh = a + bΣ | Mk _i −Mk _Zn | × X _i (where a is a value within the range of 62 to 74, and b is 26).
0, Mk _i is the Mk value of the i element, and Mk _Zn is Z
a zinc alloy having a desired Brinell hardness, which is a Mk value of an n element and X _i is a mole fraction of the i element).