Cu、Mg、Ag元素对Al-Cu-Mn合金铸造性能的影响  

Effects of Cu, Mg and Ag Elements on Casting Properties of Al-Cu-Mn Alloy

作　　者：吴良玉 陈大辉[1] 付玉 张将[1] 洪晓露[1] 朱秀荣[1] Wu Liangyu;Chen Dahui;Fu Yu;Zhang Jiang;Hong Xiaolu;Zhu Xiurong(The Ningbo Branch of Ordnance Science Institute of China,Ningbo 315100)

机构地区：[1]中国兵器科学研究院宁波分院,宁波315100

出　　处：《特种铸造及有色合金》2024年第4期532-535,共4页Special Casting & Nonferrous Alloys

基　　金：基础加强计划重点基础研究项目(2021-173ZD-044)。

摘　　要：Al-Cu合金具有较高的力学性能和断裂韧度,但较差的铸造性能限制了其在复杂铸件上的应用。研究了Cu、Mg、Ag元素对Al-Cu-Mn合金铸造性能的影响,以期提高Al-Cu合金的铸造性能。结果表明,在Al-Cu-Mn合金中,Cu含量从5.5%提升至6.5%时,合金的流动性试样长度从598 mm提升至918 mm,热裂倾向显著降低,热裂环宽度从20 mm降至15 mm以下。单独加入Ag时,能够提高合金的流动性但对热裂倾向影响不大。添加Mg、Ag时,形成的低熔点S-Al_(2)CuMg相使合金液的流动性提升,但降低了抗热裂性能。Al-Cu alloy exhibits desirable mechanical properties and fracture toughness. However, poor casting properties limit the application in complex castings. Effects of Cu, Mg and Ag elements on casting properties of Al-Cu-Mn alloys were investigated to improve the casting capacity of Al-Cu alloy. The results indicate that when the Cu content is increased from 5.5% to 6.5%, the flow sample length of the alloy is increased from 598 mm to 918 mm with reduction of hot cracking tendency, and the hot crack ring width is decreased significantly from 20 mm to less than 15 mm.Single Ag addition can improve the fluidity of the alloy, which has little effect on hot cracking tendency. When Mg and Ag are compound added, the low melting point S-(Al_(2)CuMg) phase is formed, enhancing the fluidity of alloy melt and reducing the resistance to hot cracking.

关 键 词：AL-CU合金 热裂 流动性 Mg AG 

分 类 号：TG146.21[一般工业技术—材料科学与工程]