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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Zr55Cu33Al10Ni5块体非晶合金退火处理后脉冲激重熔晶化行为
DOI: 10.3724/SP.J.1037.2012.00680, PP. 649-657
Keywords: Zr55Cu30Al10Ni5块体非晶合金,退火处理,激光,外延生长
Abstract:
将Cu模铸造得到的Zr55Cu30Al10Ni5块体非晶合金分别在390,430,530,792和902℃进行退火处理,并采用脉冲激光对其进行重熔,研究基材晶化特征对熔池及热影响区晶化行为的影响.结果表明,未晶化的退火处理试样(经390和430℃退火处理)在激光重熔后,热影响区的晶化特征不受初始退火处理温度的影响.完全晶化的退火处理试样(经530,792和902℃退火处理)在激光重熔后,熔池基本上保持了非晶状态.经530和792℃退火处理后试样的熔池底部没有发现外延生长现象.经902℃退火处理的试样在激光重熔后,单次激光重熔的熔池底部有少量的外延生长,而经11次激光重熔的熔池底部无外延生长.分析表明,外延生长是因为CuZr2初生相在重熔过程中在熔池底部产生了成分保留区域.由于熔池内非晶合金的扩散缓慢,在激光重熔Zr55Cu30Al10Ni5非晶合金过程中,熔池底部即使是晶态也难以产生外延生长,所以激光加工Zr55Cu30Al10Ni5非晶合金时,熔池内很容易保持非晶状态.
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