Dynamic mechanical property testing device for amorphous alloy and method thereof

[0080] Example 1

[0081] (1) Preparation ZR 58 Cu 12 Ni 12 Al 15 NB 3 Amorphous alloy: Zr, Cu, Ni, Al, Nb, and 5 metals with purity ≥99.99%, according to atomic percentage 58: 12: 12: 12: 15: 3, in high purity argon atmosphere, arc smelting, first Slubing the Zr-Nb dual alloy, then mixed with other metal elements, the mild macaronium, then the alloy ingot was melted into the copper mold, and the copper mold size was φ5 mm * 50 mM, and the Zr group amorphous alloy sample was prepared.

[0082] (2) Processing the sample into a cylindrical sample of φ3mm * 3 mm 7, using 400 # -2000 # sandpaper from small to the upper bottom surface of the large grinding cylindrical sample, so that the plane of the two end faces of the sample 7 is better than 5 μm, and then Rinse dry with anhydrous ethanol.

[0083] (3) Place the sample 7 between the incident rod 4 and the transmitted rod 9, the outer diameter of the 18Ni300 martensite-effect steel is 16 mm, the inner diameter is 7mm, the height of 2.85 mm is placed around the sample, The sample 7 is placed at both ends of the 18ni300 martensite, and the mass 5 having a diameter of 16 mm and a height of 3 mm, ensures the coaxial degree of the entire load device, and the two end faces of the sample 7 are applied to MOS. 2Reduce friction; Examples waveform shaper diameter copper plate 2 in this embodiment is 6mm, a thickness of 2mm. The recovery device provided with through holes at both ends of the upper half of the load bar 8 is fixed to the lower half 7 is positioned directly below the test sample, the sample 7 for recovery.

[0084] (4) the compressed gas pressure in the air gun was 0.4MPa, strikes a striking lever at a front end of the rod 4 enters the gas pressure of the copper sheet 2, the sample 7 is compressed and deformed, the strain gauge 3 will be collected incident wave, the reflected and transmitted waves 12 transmitted by the high dynamic strain to a computer 13, a waveform of FIG incident, reflected and transmitted waves in the computer 13, such as figure 2 Shown; using computer software in the D-wave waveform chart obtained is processed to give an amorphous dynamic compression test specimen strain rate - time curve, such as image 3 Shown; stress - strain curve, such as Figure 4 Indicated.

[0085] (5) by the image 3 Dynamic compressive strain rate - time curve shows that the presence of the internet strain rate curve, corresponding to the embodiment of this constant strain rate 1200s- 1. Depend on Figure 4 Accordingly, under this strain rate, dynamic compression strength was 1497MPa, the dynamic strain at break was 1.95%.

[0086] (6) For the present embodiment, amorphous alloy, Sample 7 the length L s Of 3mm, under dynamic loading, sample 7 break strain was 1.95%. The stress balancing requirements calculated by the equation (1) limit strain rate 7834s- 1 , Far above the corresponding dynamic loading of the present embodiment, constant strain rate 1200s- 1 This experiment, the stress balancing requirements to meet; In the present embodiment, the parameters for the Hopkinson bar: density ρ = 7.9g / cm 3 , Diameter D = 16mm, the longitudinal wave velocity C = 5189m / s, Poisson's ratio ν = 0.3; Sample 7 parameters: - density ρ s = 6.55g / cm 3 Diameter D s = 3mm, a length L s = 3mm, longitudinal wave velocity Cs = 4821m / s. Constant strain rate limit values ​​into the above equation (2), the sample is calculated 2235s- 1; (3) calculate the minimum dispersion effect of strain rate corresponding to the limit by the formula 2507s- 1 , Strain rate greater than the time of the present embodiment dynamically loaded embodiment 1200s- 1. In summary, the present embodiment satisfy the amorphous alloy SHPB experimental stress balance, and the constant strain rate loading effect requires a minimum dispersion, Thus, the dynamic compression results are reliable.

[0087] Example 2

[0088] Preparation of (1) Zr 63 CU 12 Ni 12 Al 10 NB 3 Amorphous Alloy: purity ≥99.99% of Zr, Cu, Ni, Al, Nb, 5 63 atomic percent of metal in accordance with: for 3 ratio, arc melting under high purity argon gas atmosphere, first: 12: 12: 10 melting Zr-Nb binary alloy, and then mixed with other metal elements melting the mother alloy ingot, the alloy ingot is then poured into the molten copper mold, copper mold size Φ5mm * 50mm, the preparation of Zr-based amorphous alloy sample.

[0089] (2) the sample was processed into a cylindrical sample Φ3mm * 3mm 7, using # -2000 # 400 emery paper down to a bottom surface of large from small sample grinding cylinder, so that the flatness of the two end faces of the sample 7 is better than 5 m, then rinsing and drying with anhydrous ethanol.

[0090] (3) The sample is placed in the entrance 7 between the rod 4 and the transmission rod 9, the outside diameter of the maraging steel 18Ni300 16mm, an inner diameter of 7mm, the height of the surrounding ring 6 is placed in the sample limit is 2.85mm, sample 7 is placed at both ends of maraging steel made 18Ni300 diameter of 16mm, a height of 3mm pad 5, to ensure concentricity of the entire loading apparatus, the two end faces 7 samples are applied MoS 2 Reduce friction; Examples waveform shaper diameter copper plate 2 in this embodiment is 6mm, a thickness of 1mm. The recovery device provided with through holes at both ends of the upper half of the load bar 8 is fixed to the lower half 7 is positioned directly below the test sample, the sample 7 for recovery.

[0091] (4) the compressed gas pressure in the air gun was 0.4MPa, strikes a striking lever at a front end of the rod 4 enters the gas pressure of the copper sheet 2, the sample 7 is compressed and deformed, the strain gauge 3 will be collected incident wave, the reflected and transmitted waves 12 transmitted by the high dynamic strain to a computer 13, a waveform of FIG incident, reflected and transmitted waves in the computer 13, such as Figure 5 Shown; using computer software in the D-wave waveform chart obtained is processed to give a stress test sample of amorphous - strain curve, such as Image 6 Indicated.

[0092] (5) by the Figure 5 Waveform seen in FIG strain rate internet presence reflected wave is calculated in this case a constant strain rate corresponding to the embodiment 1450s- 1. Depend on Image 6 Accordingly, under this strain rate, dynamic compression strength was 1483MPa, the dynamic strain at break was 1.85%.

[0093] (6) For the present embodiment, amorphous alloy, Sample 7 the length L s Of 3mm, under dynamic loading, sample 7 break strain was 2.65%. 1, the sample in Example 7 parameters Parameter same embodiment as Hopkinson bar: the density ρ s = 6.75g / cm 3 Diameter D s = 3mm, a length L s = 3mm, longitudinal wave velocity Cs = 4823m / s. The stress balancing requirements calculated by the equation (1) limit strain rate 7435s- 1 , Constant strain rate limit by the formula (2) the sample is calculated 2209s- 1; (3) calculate the minimum dispersion effect of strain rate corresponding to the limit by the formula 2379s- 1 , Strain rate greater than the time of the present embodiment dynamically loaded embodiment 1450s- 1. In summary, the present embodiment satisfy the amorphous alloy SHPB experimental stress balance, and the constant strain rate loading effect requires a minimum dispersion, Thus, the dynamic compression results are reliable.