(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用熔煉鑄造與鍛造變形方法制備含0.3%Sc的AA7150鋁合金。通過拉伸測試、剝落腐蝕測試、金相及透射電鏡等技術(shù)方法，研究不同淬火工藝對鍛造態(tài)鋁合金性能及顯微組織的影響。結(jié)果表明：鋁合金在空氣中自然冷卻時，T6時效態(tài)合金的抗拉強度與抗剝落腐蝕性能層嚴重降低；而室溫水淬的T6時效態(tài)合金比室溫油淬的T6時效態(tài)合金具有更好的塑性。當(dāng)預(yù)先采用(80 ℃，30 s)水淬火或(80 ℃，30 s)油淬火再15 ℃水淬時，T6時效態(tài)合金的抗拉強度明顯得到提高，且抗剝落腐蝕性能也得到了改善。預(yù)先80 ℃淬火能提高T6時效態(tài)合金性能的主要原因是時效態(tài)合金晶界析出相的尺寸與離散度明顯增大。
關(guān)鍵字: AA7150鋁合金；淬火；力學(xué)性能；剝落腐蝕；顯微組織
aluminum alloy AA7150 with minor Sc
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The aluminum alloy AA7150 with 0.3%Sc was prepared by melting and casting technique and forging deformation method. The effects of different quenching techniques on the tensile strength, exfoliation corrosion properties and microstructure of the alloy were investigated by using tensile testing, exfoliation corrosion, optical microscope and transmission electron microscopy (TEM). The results show that the air quenching at room temperature decreases the tensile strength and exfoliation corrosion-resistance properties of the alloy after aging at T6 treatment. The elongation of the alloy with water quenching at room temperature is higher than that of the alloy with oil quenching at room temperature. The tensile strength and exfoliation corrosion properties can be improved after (80 ℃, 30 s) water quenching+15 ℃ water quenching or (80 ℃, 30 s) oil quenching+15 ℃ water quenching. Prequenching at 80 ℃ can improve the grain boundary precipitation of the alloys, which is the reason why the properties of the alloy after aging at T6 treatment are improved.
Key words: aluminum alloys AA7150; quenching; mechanical properties; exfoliation corrosion; microstructure
