Forming of thin-walled cylindrical cup by impact backward extrusion of Al-Si alloys processed by semi-solid cast and ECAP
Forming of thin-walled cylindrical cup by impact backward extrusion of Al-Si alloys processed by semi-solid cast and ECAP
复制标题
半固态铸造和ECAP加工铝硅合金的冲击反向挤压薄壁圆柱杯成形
DOI：
10.1016/j.jmatprotec.2021.117277
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发表时间：
2021
影响因子：
6.3
通讯作者：
Tatsuya Tanaka
中科院分区：
文献类型：
--
作者：
Keiko Natori;Hiroshi Utsunomiya;Tatsuya Tanaka
虽然冲击反挤压在制造薄壁杯形件方面具有高生产率的优势，但应用仅限于低强度材料。为了制造高强度薄壁筒形件，采用半固态铸造和等径角挤压两种细化方法相结合的方法，制备了具有不同共晶组织的JISAC 4CH铸造合金（Al-7.14%Si-0.41%Mg）。采用冲击反挤压方法成功地将该合金成形为薄壁铝筒形件。通过晶粒细化，改善了挤压加工性能。然而，不可避免的杯偏心发生不依赖于工件材料。结果表明，在不产生裂纹的情况下，可以用最大偏心距来评价工件的加工性能。结果表明，ECAP处理后的半固态铸造合金的加工性能与退火态AA 3003合金相近;与退火态AA 3003合金相比，ECAP处理后的半固态铸造合金具有更高的强度和塑性。
Although impact backward extrusion has advantages in manufacturing of thin-walled cup at high productivity, applications are limited to materials with low strength. In order to manufacture thin-walled cup with high strength, the authors prepared JIS AC4CH cast alloys (Al-7.14%Si-0.41%Mg) having various eutectic microstructures by combination of two refinement methods: semi-solid casting and ECAP process. Thin-walled aluminum cylindrical cups were successfully formed by impact backward extrusion from the modified cast alloy. Improvement of workability for the extrusion was achieved by grain refinement. However, an unavoidable eccentricity of cup occurred without depending on workpiece materials. It is found that workability of the workpiece can be evaluated by maximum eccentricity without causing cracks. It is concluded that the ECAPed semi-solid cast alloy has workability next to annealed AA3003 alloys; a product of the ECAPed semi-solid cast alloy has high strength and ductility compared with that of annealed AA3003.