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

金属学报

2012, Vol. 48

Issue (12): 1467-1473 DOI: 10.3724/SP.J.1037.2012.00433

论文

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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

胡桥¹,林鑫¹,杨高林¹,黄卫东¹,李金富²

1.西北工业大学凝固技术国家重点实验室, 西安 710072
2.上海交通大学材料科学与工程学院, 上海 200240

CRYSTALLIZATION BEHAVIOR OF Zr₅₅Al₁₀Ni₅Cu₃₀ AMORPHOUS ALLOYS WITH DIFFERENT MORPHOLOGIES AND THERMAL HISTORY CONDITIONS

HU Qiao¹, LIN Xin¹, YANG Gaolin¹, HUANG Weidong¹,LI Jinfu²

1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072
2.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240

引用本文:

胡桥林鑫杨高林黄卫东李金富. 不同形态和热历史条件下Zr₅₅Al₁₀Ni₅Cu₃₀非晶合金的晶化行为[J]. 金属学报, 2012, 48(12): 1467-1473.
HU Qiao LIN Xin YANG Gaolin ANG Weidong LI Jinfu. CRYSTALLIZATION BEHAVIOR OF Zr₅₅Al₁₀Ni₅Cu₃₀ AMORPHOUS ALLOYS WITH DIFFERENT MORPHOLOGIES AND THERMAL HISTORY CONDITIONS[J]. Acta Metall Sin, 2012, 48(12): 1467-1473.

全文: PDF(2129 KB)

摘要:

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T_x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.

关键词 ：非晶合金, 热历史, 热处理, 激光, 晶化

Abstract：

This work investigated the crystallization behavior of Zr₅₅Al₁₀Ni₅Cu₃₀ amorphous alloy (bulk and powder with different morphologies) under different heating and cooling rate conditions, and has found that the crystallization behavior of Zr₅₅Al₁₀Ni₅Cu₃₀ under different thermal history conditions was quite different. Under conventional heat treatment condition, the heating and cooling rates of the alloy were lower, the Zr₅₅Al₁₀Ni₅Cu₃₀ bulk amorphous alloy began to crystallization above the outset crystallization temperature Tx, the CuZr₂ nanocrystalline was formed. With increasing temperature, its grain size became bigger, when exceeding the melting point, the thick CuZr₂ lath+eutectic organizations of lath (CuZr₂)+(Zr, Cu, Al, Ni) were formed under furnace cooling condition; under laser melting condition, however, the heating and cooling rates of alloy were higher, with increasing number of pulse frequency, the crystallization effect of Zr₅₅Al₁₀Ni₅Cu₃₀ bulk amorphous alloy accumulated gradually, in heat affected zone spherulites were precipitated and grew up, subsequently became unstable and finally a belt of equiax crystals were formed along the weld pool boundary. For amorphous alloy powder, due to its poorer the cooling performance than bulk amorphous, the cooling rate was lower, causing the powder particles crystallized into equiaxed dendrite during laser melting process, and with increasing laser energy, the equiaxed dendrite size increased.

Key words： amorphous alloy thermal history heat treatment laser crystallization

收稿日期: 2012-07-19

ZTFLH:

TG24

基金资助:

国家自然科学基金项目50971102和50901061,国家重点基础研究发展计划项目2011CB610402资助

作者简介: 胡桥, 男, 1989年生, 硕士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00433 或 https://www.ams.org.cn/CN/Y2012/V48/I12/1467

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