J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (12): 1297-1302.DOI: 10.1016/j.jmst.2016.05.019
• Orginal Article • Previous Articles Next Articles
Du Jun1(
),Shi Yutong1,Zhou Mingchuan1,Li Wenfang1
Received:2016-03-06
Accepted:2016-05-23
Online:2016-12-20
Published:2017-02-16
Du Jun,Shi Yutong,Zhou Mingchuan,Li Wenfang. Effect of Sr on Grain Refinement of Mg-3%Al Alloy Containing Trace Fe by Carbon-Inoculation[J]. J. Mater. Sci. Technol., 2016, 32(12): 1297-1302.
| Process No. | Process conditions |
|---|---|
| 1 | Without any treatment |
| 2 | Treated by carbon-inoculation |
| 3 | Treated by combining carbon-inoculation with Sr addition |
| 4 | Fe pre-existed in melt Treated by combining carbon-inoculation with Sr addition |
| 5 | Treated by combining carbon-inoculation with Sr addition firstly, and then further treated by Fe addition. The melt was held for 10 min before being poured. |
| 6 | Treated by process No. 5. The holding time was prolonged to 20 min after Fe addition. |
| 7 | Treated by Fe addition |
| 8 | Treated by combining addition of Fe and Sr |
Table 1. Mg-3%Al melt treated by different process conditions
| Process No. | Process conditions |
|---|---|
| 1 | Without any treatment |
| 2 | Treated by carbon-inoculation |
| 3 | Treated by combining carbon-inoculation with Sr addition |
| 4 | Fe pre-existed in melt Treated by combining carbon-inoculation with Sr addition |
| 5 | Treated by combining carbon-inoculation with Sr addition firstly, and then further treated by Fe addition. The melt was held for 10 min before being poured. |
| 6 | Treated by process No. 5. The holding time was prolonged to 20 min after Fe addition. |
| 7 | Treated by Fe addition |
| 8 | Treated by combining addition of Fe and Sr |
Fig. 1. Grain morphologies of the Mg-3% Al alloy treated through different processes (a - No. 1, b - No. 2, c - No. 3, d - No. 4, e - No. 5, f - No. 6).
| Process No. | Grain size (μm) | Vickers hardness (HV) |
|---|---|---|
| 1 | 725 ± 29.5 | 44.9 ± 1.4 |
| 2 | 235 ± 9.3 | 46.7 ± 2.4 |
| 3 | 168 ± 8.1 | 50.7 ± 3.7 |
| 4 | 172 ± 12.5 | 50.2 ± 3.4 |
| 5 | 174 ± 9.2 | 50.4 ± 2.7 |
| 6 | 167 ± 8.4 | 50.1 ± 3.6 |
| 7 | 532 ± 28.7 | 46.2 ± 2.6 |
| 8 | 558 ± 22.8 | 46.8 ± 3.1 |
Table 2. Average grain size and Vickers hardness of the samples prepared through different processes
| Process No. | Grain size (μm) | Vickers hardness (HV) |
|---|---|---|
| 1 | 725 ± 29.5 | 44.9 ± 1.4 |
| 2 | 235 ± 9.3 | 46.7 ± 2.4 |
| 3 | 168 ± 8.1 | 50.7 ± 3.7 |
| 4 | 172 ± 12.5 | 50.2 ± 3.4 |
| 5 | 174 ± 9.2 | 50.4 ± 2.7 |
| 6 | 167 ± 8.4 | 50.1 ± 3.6 |
| 7 | 532 ± 28.7 | 46.2 ± 2.6 |
| 8 | 558 ± 22.8 | 46.8 ± 3.1 |
Fig. 2. Grain morphologies of the Mg-3% Al alloy treated with 0.1%Fe addition (a) and combining additions of 0.1%Fe and 0.2%Sr (b).
Fig. 3. EPMA-BSE images of the particles in the sample modified by different processes (a - No. 2, b - No. 3, c - No. 4, d - No. 5).
Fig. 4. High magnification EPMA-BSE image (a) and EPMA line analysis (b) across the two duplex-phase particles in the sample treated by Fe addition before carbon-inoculation combining Sr addition.
| Area | C | O | Mg | Al | Sr | Fe |
|---|---|---|---|---|---|---|
| Central area (denoted by A) | 7.44 | 13.66 | 23.65 | 22.64 | 0.66 | 31.95 |
| Outer area (denoted by B) | 6.26 | 11.54 | 77.64 | 3.94 | 0.15 | 0.47 |
| Mg matrix (denoted by C) | 2.84 | 1.55 | 94.08 | 1.40 | 0.14 | 0 |
Table 3. Composition of different areas denoted by A, B and C obtained by EPMA (in wt%)
| Area | C | O | Mg | Al | Sr | Fe |
|---|---|---|---|---|---|---|
| Central area (denoted by A) | 7.44 | 13.66 | 23.65 | 22.64 | 0.66 | 31.95 |
| Outer area (denoted by B) | 6.26 | 11.54 | 77.64 | 3.94 | 0.15 | 0.47 |
| Mg matrix (denoted by C) | 2.84 | 1.55 | 94.08 | 1.40 | 0.14 | 0 |
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