Hot deformation behavior and processing map development of AZ110 alloy with and without addition of La-rich Mish Metal

doi:10.1016/j.jmst.2020.04.064

Abstract

Abstract:

In order to compare the workability of AZ110 alloy with and without addition of La-rich Mish Metal (MM), hot compression tests were performed on a Gleeble-3500D thermo-mechanical simulator at the deformation temperature range of 473-623 K and strain rate range of 0.001-1 s^-1. The flow stress, constitutive relation, DRX kinetic model, processing map and microstructure characterization of the alloys were investigated. The results show that the flow stress is very sensitive to deformation temperature and strain rate, and the peak stress of AZ110LC (LC = La-rich MM) alloy is higher than that of AZ110 alloy. The hot deformation behavior of the alloys can be accurately predicted by the constitutive relations. The derived constitutive equations show that the calculated activation energy Q and stress exponent n for AZ110 alloy are higher than the calculated values of AZ110LC alloy. The analysis of DRX kinetic models show that the development of DRX in AZ110LC alloy is earlier than AZ110 alloy at the same deformation condition. The processing maps show that the workability of AZ110LC alloy is significantly more excellent than AZ110 alloy and the microstructures are in good agreement with the calculated results. The AZ110LC alloys can obtain complete DRX microstructure at high strain rate due to its higher stored energy and weak basal texture.

Key words: AZ110 magnesium alloy, La-rich Mish Metal, Hot deformation, Dynamic recrystallization, Constitutive model, Processing map

Qiyu Liao, Yanchao Jiang, Qichi Le, Xingrui Chen, Chunlong Cheng, Ke Hu, Dandan Li. Hot deformation behavior and processing map development of AZ110 alloy with and without addition of La-rich Mish Metal[J]. J. Mater. Sci. Technol., 2021, 61: 1-15.

Figures/Tables 18

Table 1 Chemical compositions of the experimental alloys (wt%).

Designation	Al	Zn	Mn	Fe	La	Ce	Mg
AZ110	10.8	0.44	0.11	<0.003	-	-	Bal.
AZ110LC	10.5	0.40	0.08	<0.003	1.22	0.62	Bal.

Fig. 1. SEM images of the as-cast alloys: (a) AZ110; (b) AZ110LC; (c-f) the corresponding EDS results of the secondary phases.

Fig. 2. XRD patterns of the as-cast alloys.

Fig. 3. True stress and strain curves of (a-d) as-cast AZ110 and (e-h) as-cast AZ110LC alloys.

Table 2 Peak stresses (MPa) of the as-cast AZ110 and AZ110LC alloys under different deformation conditions.

Alloys	Temperature	Strain rate
Alloys	Temperature	0.001 s^-1	0. 01 s^-1	0.1 s^-1	1 s^-1
AZ110	473K	110.5	132.6	178.1	206
	523K	80.5	93.5	130.9	162.9
	573K	55.7	90.3	109.2	110.6
	623 K	24	63.4	63.9	89.2
AZ110LC	473K	160	196.3	232.1	258.5
	523K	108	146	169.1	212
	573K	81.7	102.9	132	167
	623 K	53.8	73.1	92.3	127

Fig. 4. Peak stresses of the as-cast AZ110 and AZ110LC alloys under different deformation conditions.

Fig. 5. The linear relationship fitting at peak stress: (a) $\ln\dot{ε}$ -lnσ; (b) $\ln\dot{ε}$ - σp; (c) $\ln\dot{ε}$ - $\text{ln}\left[ \text{sinh}(a{{\sigma }_{\text{p}}}) \right]$; (d) $\text{ln}\left[ \text{sinh}(a{{\sigma }_{\text{p}}}) \right]$ -1000/T.

Table 3 Linear regression analysis results of the relationship between peak stress and strain rate of AZ110 and AZ110LC alloys.

Alloys	Deformation temperature (K)	$\ln\dot{ε}$-lnσ_p				$\ln\dot{ε}$- $\text{ln}\left[ \text{sinh}(a{{\sigma }_{\text{p}}}) \right]$
		Regression	Correlation	Regression	Correlation	Regression	Correlation
		equation	coefficient	equation	coefficient	equation	coefficient
AZ110	473	y=5.80x-9.08	0.71227	y=0.11x-9.68	0.82583	y=5.80x-9.08	0.97770
	523	y=6.12x-6.37	0.72786	y=0.11x-13.31	0.78911	y=6.12x-6.37	0.96310
	573	y=6.79x-4.33	0.97145	y=0.08x-12.59	0.95173	y=6.79x-4.33	0.96123
	623	y=4.42x-1.46	0.97619	y=0.07x-14.13	0.97525	y=4.42x-1.46	0.97856
AZ110LC	473	y=8.05x-11.0	0.98505	y=0.07x-18.80	0.98226	y=8.05x-10.9	0.98874
	523	y=7.16x-6.73	0.96997	y=0.07x-14.22	0.97825	y=7.16x-6.73	0.98978
	573	y=7.45x-4.01	0.97400	y=0.08x-13.09	0.98255	y=7.45x-4.01	0.99655
	623	y=7.06x-1.01	0.97300	y=0.09x-11.58	0.96333	y=7.06x-1.01	0.99176

Fig. 6. The relations fitting between materials parameters strains of the experimental alloys: (a) α; (b) n; (c) Q; (d) lnA.

Table 4 The coefficients of fourth order polynomial function for AZ110 and AZ110LC alloys.

Alloys	α	value	n	value	Q	value	lnA	value
AZ110	α₀	0.00762	n₀	5.55944	Q₀	55.52875	a₀	9.74276
	α₁	0.04278	n₁	12.44057	Q₁	664.0406	a₁	116.7754
	α₂	-0.1866	n₂	-127.35731	Q₂	-2185.60998	a₂	-337.7901
	α₃	0.38565	n₃	415.10861	Q₃	55.19.40994	a₃	905.57349
	α₄	-0.27083	n₄	-402.85536	Q₄	-5954.34044	a₄	-1072.76413
AZ110LC	α₀	0.0119	n₀	21.12167	Q₀	239.35	a₀	44.81667
	α₁	-0.06842	n₁	-144.84378	Q₁	-972.25397	a₁	-174.30688
	α₂	0.35135	n₂	519.59028	Q₂	4173.125	a₂	729.65277
	α₃	-0.71944	n₃	-817.5463	Q₃	-7568.05556	a₃	-1267.12961
	α₄	0.54167	n₄	464.58333	Q₄	4895.83333	a₄	770.83332

Fig. 7. Comparison between the experimental and predicted flow stress of (a-d) as-cast AZ110 and (e-h) as-cast AZ110LC alloys.

Fig. 8. Relationship of (a) θ-σ and (b) ?θ/?σ at temperature of 573 K and strain rate of 0.001 s-1.

Fig. 9. The volume fraction of DRX (XDRX) of the investigated alloys obtained under different temperatures with strain rates of (a) 0.001 s-1, (b) 0.01 s-1, (c) 0.1 s-1 and (d) 1 s-1.

Fig. 10. Processing maps for the alloys at strain of 0.1, 0.3 and 0.5. (a), (c) and (e) are for AZ110 alloy and (b), (d) and (f) are for AZ110LC alloy.

Fig. 11. Microstructures and texture of specimens tested at 473 K and 1 s-1 of the AZ110 and AZ110LC alloys. The IPF maps of the two alloys are shown in (a) and (c), respectively. The micro texture of the two alloys are shown in (b) and (d), respectively.

Fig. 12. Microstructures and texture tested at 473 K and 0.001 s-1 of the AZ110 and AZ110LC alloys. The IPF maps of the two alloys are shown in (a) and (c), respectively. The micro texture of the two alloys are shown in (b) and (d), respectively.

Fig. 13. Microstructures and texture tested at 623 K and 1 s-1 of the AZ110 and AZ110LC alloys. The IPF maps of the two alloys are shown in (a) and (c), respectively. The micro texture of the two alloys are shown in (b) and (d), respectively.

Fig. 14. Microstructures and texture tested at 623 K and 0.001 s-1 of the AZ110 and AZ110LC alloys. The IPF maps of the two alloys are shown in (a) and (c), respectively. The micro texture of the two alloys are shown in (b) and (d), respectively.

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