Growth characteristics of θ(Al2Cu) phase in ZL205A alloy under synergistic field between alternating magnetic field and vacuum counter-pressure [交变磁场-真空差压协同场下ZL205A合金θ(Al2Cu)相的生长特性]

作者：Huang P.-P.; Lu G.^*; Yan Q.-S.; Luo G.-M.

来源：Chinese Journal of Nonferrous Metals, 2020, 30(11): 2540-2549.

DOI：10.11817/j.ysxb.1004.0609.2020-37683

• Alternating magnetic field
• Growth orientation
• Morphology
• Solidification pressure
• Θ(Al2Cu) phase

The effects of excitation current and solidification pressure on the growth orientation and morphology of θ(Al2Cu) phase in ZL205A alloy were analyzed by means of SEM and XRD. The growth characteristics of θ(Al2Cu) phase in ZL205A alloy under alternating magnetic field-vacuum counter-pressure were investigated. The results show that the synergistic effect of alternating magnetic field-vacuum counter-pressure on the growth orientation and morphology of θ(Al2Cu) phase in ZL205A alloy is significant. With the increase of excitation current, the preferred growth orientation planes (110), (211), (112), (310) and (202) of ZL205A alloy are gradually suppressed. When the excitation current is increased to 10A, the (112) crystal plane is completely suppressed, and the θ(Al2Cu) phase morphology in ZL205A alloy is coarsened. When the excitation current exceeds 10 A and increases to 15 A, the preferred growth orientations of θ(Al2Cu) phase are only (110) and (211), and the other growth orientations are completely suppressed. And most of the θ(Al2Cu) phase structure changes from a continuous branch network to a fine fragment. With the increase of solidification pressure, the main growth preferred orientation planes (110), (211), (112) and (202) of θ(Al2Cu) phase in ZL205A alloy are gradually suppressed, and the refinement effect of θ(Al2Cu) phase is more remarkable. Meanwhile, the optimal synergistic effect is obtained when the excitation current is 15 A and solidification pressure is 350 kPa.