Method for enhancing work hardening capacity of beta-type amorphous alloy endogenous composite material

A composite material and amorphous alloy technology is applied in the field of improving the work hardening ability of β-type amorphous alloy endogenous composite materials, which can solve the problems of weak work hardening ability and restricting the practical application of structural materials.

Inactive Publication Date: 2017-03-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These β-type amorphous alloy endogenous composites usually have weak work hardening ability, which limits their practical application as structural materials.

Method used

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  • Method for enhancing work hardening capacity of beta-type amorphous alloy endogenous composite material
  • Method for enhancing work hardening capacity of beta-type amorphous alloy endogenous composite material
  • Method for enhancing work hardening capacity of beta-type amorphous alloy endogenous composite material

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Experimental program
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Effect test

Embodiment 1

[0047] For the nominal composition (Ti 50.5 Zr 35.3 Fe 2.8 be 11.4 ) 100-x Cu x (atomic percent) alloy, x is taken as 8 or 5, and is defined as Cu8 or Cu5 alloy, respectively. The alloy with the nominal composition of Cu8 or Cu5 was cast into a round rod with a diameter of 6 mm through a Cu mold. The microstructures of Cu8 and Cu5 alloys are both amorphous alloy endogenous composite materials: the β phase is distributed in the continuous amorphous matrix, see figure 1 (a) and (b). The particle diameters and volume fractions of the beta phase in both samples are listed in Table 1 below. The average particle diameter and volume fraction of the β phase increased with decreasing Cu content. The chemical composition of the β-phase in the two samples was characterized by the electron spectrum of the scanning electron microscope, which is listed in Table 1. With the decrease of the Cu content in the nominal composition of the alloy, the molybdenum equivalent ([Mo] eq ) was ...

Embodiment 2

[0054] For the nominal composition (Ti 50.5 Zr 35.3 Fe 2.8 be 11.4 ) 100-x Cu x (atomic percent) alloy, x is taken as 1, and defined as Cu1 alloy. An alloy with a nominal composition of Cu1 was cast into a round rod with a diameter of 6 mm through a Cu mold. The microstructure of Cu1 alloy is also an amorphous alloy endogenous composite material, see figure 1 (c). Comparing the Cu8 and Cu5 alloys in Example 1, with the further reduction of the Cu content, the average particle diameter and volume fraction of the β phase in the Cu1 alloy further increased, and the molybdenum equivalent of the β phase stable elements (Cu, Fe) in the β phase further decreased , see Table 1.

[0055] Unlike the β phase in Cu8 and Cu5 alloys, a large number of dispersed ω phases are generated inside the β phase in Cu1 alloy, see Figure 5 (a) and (b). This is due to the very low structural stability of the β phase in the Cu1 alloy, resulting in the collapse of the body-centered cubic latti...

Embodiment 3

[0057] For the nominal composition (Ti 50.5 Zr 35.3 co 2.8 be 11.4 ) 100-x Cu x (atomic percent) alloy, x is taken as 8 or 5, and these two alloys are defined as CC-Cu8 and CC-Cu5 respectively.

[0058]The alloys with the nominal composition of CC-Cu8 and CC-Cu5 were prepared into round rods with a diameter of 6 mm through Cu mold casting. These two alloy rods are both amorphous alloy endogenous composite materials. Cut 3 x 3 x 6mm from a 6mm round bar 3 The compression test was carried out on compression specimens of different sizes. The true stress-strain curves of the two alloys are Figure 6 shown. The CC-Cu8 alloy yielded at 1220MPa, and the stress continued to increase to 1500MPa at fracture (true strain of 8%) after yielding. Its work hardening ability is small. The CC-Cu5 alloy yielded at 1050MPa, and its true stress increased significantly after yielding to 1650MPa where the true strain was 10%, then the stress decreased slightly, and failure occurred when ...

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Abstract

The invention discloses a method for enhancing work hardening capacity of a beta-type amorphous alloy endogenous composite material and belongs to the technical field of an amorphous alloy composite material. According to the method, content of beta-phase stable element in the chemical components of the beta-type amorphous alloy endogenous composite material is adjusted such that the beta-phase has proper structural metastability. Then, an obtained sample can undergo deformation-induced martensitic transformation and/or twinning so as to enhance work hardening capacity of the beta-type amorphous alloy endogenous composite material. The key of the method is to regulate and control structural metastability of the in-situ precipitated beta-phase. The method has important value for designing and developing the beta-type amorphous alloy endogenous composite material with excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of amorphous alloys and their composite materials, in particular to a method for improving the work-hardening ability of beta-type amorphous alloy endogenous composite materials. Background technique [0002] The way to obtain endogenous composites of amorphous alloys is through the in-situ precipitation of crystalline phases during the rapid solidification of alloy melts, and the cooling rate is fast enough to cause the remaining liquid phase to be frozen into a continuous amorphous matrix. According to the different types of endogenous precipitated crystalline phases, the currently developed amorphous alloy endogenous composite materials can be divided into two categories: β-type amorphous alloy endogenous composite materials and B2-type amorphous alloy endogenous composite materials. The microstructure of β-type amorphous alloy endogenous composites is in-situ precipitated β-Ti / Zr phase (generally in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/10
CPCC22C45/10C22C1/11
Inventor 张龙张海峰朱正旺付华萌李宏王爱民
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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