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Al-Zn-Mg-Cu-Co合金粉末冶金(P/M)变形加工制品所提供的良好的综合工程性能,已远远地超过了现有铸锭冶金(I/M)变形铝合金的性能。这种P/M制品的抗应力腐蚀开裂性能比工业I/M合金制品的好。此外,在屈服强度相匹比的条件下,P/M合金MA_(87)的断裂韧性比I/M合金7049、7050和7175的也好。Co含量较高的P/M合金MA_(67)具有比P/MMA_(87)和I/M合金7050和7075还要高的强度和抗应力腐蚀开裂性能,但是断裂韧性比P/M合金MA_(87)的低。P/M变形加工制品的优越性能是由于好的冶金组织引起,该组织是在喷制粉末时由于急速凝固而达到。所研制的材料具有足够引人注目的性能,它可使现行工艺的生产规模得到扩大,扩大的规模将能加工出1500公斤的热压制坯锭,并可用生产设备加工成厚板、挤压件和模锻件用以进行全面鉴定。
The good overall engineering performance provided by Al-Zn-Mg-Cu-Co alloy powder metallurgy (P / M) deformation products far exceeds the performance of existing ingot metallurgy (I / M) . The stress corrosion cracking resistance of this P / M product is better than that of industrial I / M alloy products. In addition, the fracture toughness of PMA alloy MA 87 is better than that of I / M alloys 7049, 7050 and 7175 under the condition of yield strength match ratio. Compared with P / MMA 87 and I / M alloys 7050 and 7075, P / M alloy MA 67 with higher Co content has higher strength and stress corrosion cracking resistance, but the fracture toughness is higher than that of P / M alloy MA_ (87) low. The superior properties of P / M variants are due to the good metallurgical structure that is achieved by rapid solidification when the powder is sprayed. The material developed has a striking enough performance that it allows the current production scale to be expanded. The expanded scale will produce 1500 kg of hot-pressed billets and can be processed into slabs, And forgings for full identification.