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OALib Journal期刊
ISSN: 2333-9721
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不同形态和热历史条件下Zr55Al10Ni5Cu30非晶合金的晶化行为
DOI: 10.3724/SP.J.1037.2012.00433, PP. 1467-1473
Keywords: 非晶合金,热历史,热处理,激光,晶化
Abstract:
研究了不同形态Zr55Al10Ni5Cu30非晶合金(块体和粉末)在不同升温和冷却条件下的晶化行为.发现Zr55Al10Ni5Cu30在不同热历史下的晶化行为有较大差别.对于块体非晶合金,在常规热处理条件下,合金的升温和冷却速率较低,Zr55Al10Ni5Cu30块体非晶合金在初始晶化温度Tx以上开始晶化,形成CuZr2纳米晶.随着热处理温度的升高,晶粒尺寸增大,当热处理最终温度超过熔点后,合金在随炉冷却过程中形成了粗大的CuZr2板条+板条间(CuZr2)+(Zr,Cu,Al,Ni)共晶组织;在激光熔凝条件下,合金的升温和冷却速率较高,Zr55Al10Ni5Cu30块体非晶合金随单点熔凝次数的增加,晶化效应逐渐累加,热影响区中逐渐出现微米级球晶的弥散析出,并长大,随后失稳形成沿熔池边界带状分布,尺寸可达几百微米的等轴晶.对于粉末非晶合金,由于Zr55Al10Ni5Cu30非晶粉末的冷却强度不如块体非晶,冷却速率较块体低,造成粉末颗粒在激光熔凝过程中晶化为微米级的等轴枝晶,并随着激光能量的升高,等轴枝晶尺寸增大.
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