[논문]T6 열처리 및 저온 장시간 등온 시효한 Mg-Al 합금의 경도 및 진동감쇠능 비교

전중환

doi:10.12656/jksht.2023.36.5.277

T6 열처리 및 저온 장시간 등온 시효한 Mg-Al 합금의 경도 및 진동감쇠능 비교
Comparison of Hardness and Damping Capacities of Mg-Al Alloy Subjected to T6 Heat Treatment and Low Temperature Long Term Isothermal Aging 원문보기

열처리공학회지 = Journal of the Korean society for heat treatment, v.36 no.5, 2023년, pp.277 - 284

Abstract ▼ AI-Helper

Hardness and damping characteristics of fine discontinuous precipitates (DPs) microstructure generated by low temperature long term isothermal aging were investigated in comparison with those of T6 heat-treated microstructure composed of DPs and continuous precipitates (CPs) in Mg-9%Al alloy. In this study, T6 and fine DPs microstructures were obtained by isothermal aging at 453 K for 24 h and at 413 K for 336 h, respectively, after solution treatment at 693 K for 24 h. The DPs microstructure exhibited higher hardness than the T6 microstructure, which is related to the lower (α + β) interlamellar spacing of the DPs. The DPs microstructure possessed better damping capacity than the T6 microstructure in the strain-amplitude independent region, whereas in the strain-amplitude dependent region, the reverse behavior was observed. The damping tendencies depending on strain-amplitude were discussed based on the microstructural features of the T6 and DPs microstructures.

주제어

표/그림 (9)

그림 Fig. 1. OM images of Mg-9%Al alloy with (a) T6 and (b) DPs microstructures.
그림 Fig. 2. SEM images of Mg-9%Al alloy with T6 microstructure : (a) (DPs + CPs) microstructure, (b) enlarged image of CPs region showing fine β(Mg₁₇Al₁₂) particles and (c) enlarged image of DPs showing (α + β) lamellar morphology.
그림 Fig. 3. SEM images of Mg-9%Al alloy with DPs microstructure : (a, b) DPs microstructure containing small amount of untransformed α-(Mg) region and (c) enlarged image of DPs showing fine (α + β) lamellar morphology.
그림 Fig. 4. Vickers microhardness values of Mg-9%Al alloy with T6 and DPs microstructures.
그림 Fig. 5. Damping capacities (tan ϕ) versus strain amplitude for Mg-9%Al alloy with T6 and DPs microstructures : (a) 1 × 10^-6~1 × 10^-3 strain amplitude region, (b) low strain amplitude region below 1 × 10^-5 and (c) high strain amplitude region above 2 × 10^-4.
그림 Fig. 6. XRD patterns of Mg-9%Al alloy with T6 and DPs microstructures.
그림 Fig. 7. Granato-Lücke (G-L) plots of Mg-9%Al alloy with T6 and DPs microstructures.
표 Table 1. Lattice parameters of α-(Mg) matrix in Mg-9%Al alloy with T6 and DPs microstructures
표 Table 2. C₁ and C₂ parameters obtained from G-L plots in Fig. 7

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