钇对7085高强铝合金铸态组织的影响
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摘要
通过金相显微镜、扫描电镜、X射线衍射仪等实验方法,研究Y对7085高强铝合金铸态组织的影响。结果表明:Y能明显细化7085高强铝合金铸态组织并减少二次枝晶间距。当Y的添加量在0.3%时,铸态组织中晶粒细化效果最为显著,晶粒尺寸从120μm减少到60μm左右。Y在7085高强铝合金中主要以Al6Cu6Y和Al3Y相弥散分布在晶界上,并使得T相由网状结构变为细条状和鱼骨状。
The effect of addition of Y on the as-cast microstructure of high strength 7085 aluminum alloy was investigated by optical microscope, scanning electron microscope and X-ray diffraction, etc. The results showed that the as-cast microstructure of 7085 alloy was gradually fined with yttrium added. When the content of yttrium was 0.3%(mass fraction), and the grain size reduced from120μm to 60μm, it was fined remarkably. Due to the addition of yttrium, the Al6 Cu6 Y and Al3 Y are mainly formed and distributed at the grain boundary in 7085 alloy, which makes the reticular structure of T-phase to become a thin bar and a fishbone.
The effect of addition of Y on the as-cast microstructure of high strength 7085 aluminum alloy was investigated by optical microscope, scanning electron microscope and X-ray diffraction, etc. The results showed that the as-cast microstructure of 7085 alloy was gradually fined with yttrium added. When the content of yttrium was 0.3%(mass fraction), and the grain size reduced from120μm to 60μm, it was fined remarkably. Due to the addition of yttrium, the Al6 Cu6 Y and Al3 Y are mainly formed and distributed at the grain boundary in 7085 alloy, which makes the reticular structure of T-phase to become a thin bar and a fishbone.
引文
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[9]骆良顺,刘桐,张延宁,等.定向凝固Al-Y合金组织演化规律及小平面相生长(I):Al-15%Y过共晶合金组织演化规律[J].金属学报,2016,(07):859-865
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[2]杨海虹,胡兴华,王少华,等.7085铝合金锻件强度、硬度和电导率关系研究[J].铝加工,2012,(4):37-40
[3]陶辉锦,李绍唐,刘记立,等.Sc在铝合金中的微合金化作用机理[J].粉末冶金材料科学与工程,2008,(05):249-259
[4]高旭东,邢泽炳,季小兰,等.稀土铒(Er)对Al-4.5Mg-0.15Zr合金组织与性能的影响[J].金属热处理,2007,(08):40-43
[5]曹大力,石忠宁,杨少华,等.稀土在铝及铝合金中的作用[J].稀土,2006,(05):88-93
[6]顾静,田园,高海燕,等.Al-Zr-Y合金的时效析出机制和性能[J].中国有色金属学报,2016,(02):243-251
[7]韩剑,戴起勋,李桂荣,等.稀土钇对7055铝合金铸态组织的影响[J].材料工程,2009,(04):67-70
[8]李慧中,张新明,陈明安,等.稀土钇对2519合金组织及耐热性能的影响[J].材料科学与工程学报,2005,23(1):38-41
[9]骆良顺,刘桐,张延宁,等.定向凝固Al-Y合金组织演化规律及小平面相生长(I):Al-15%Y过共晶合金组织演化规律[J].金属学报,2016,(07):859-865
[10]王经涛,王海波,许育中,庞玉华.铸态稀土铝合金中元素分布与枝晶偏析[J].轻合金加工技术,1995,(05):35-38+34
[11]李桂荣,王宏明,赵玉涛,等.稀土钇对7055铝合金熔炼和凝固过程的作用机制[J].稀有金属材料与工程,2010,(01):80-84