本文關鍵詞： 鐵基ODS合金 界面能 液相調幅分解 納米AlO粒子 NiAl相　出處：《金屬學報》2017年08期 　論文類型：期刊論文

【摘要】：利用鋁熱合成工藝結合快速凝固技術制備了鐵基氧化物彌散強化(ODS)合金。經(jīng)過優(yōu)化鋁熱劑成分,合金熔體中不僅原位生成了a-Al_2O_3納米顆粒,還發(fā)生了液相調幅分解,形成了富Fe、Cr與富Ni、Al的兩相結構。因為a-Al_2O_3與富Ni、Al相之間的界面能較低,Al_2O_3納米顆粒與富Ni、Al相結合,從而在基體中均勻分布。分析了反應熔體發(fā)生液相調幅分解的熱力學可能性以及納米顆粒在界面能和Brownian運動影響下的移動速率。實驗結果表明,液相調幅分解得到的NiAl相呈球形,直徑約50 nm,體積分數(shù)約50%;反應合成的aAl_2O_3顆粒直徑約5 nm,受界面能作用全部與NiAl相結合。計算表明,受界面能和Brownian運動影響,a-Al_2O_3顆粒移動速率極快,快速冷卻過程中完全有時間在兩相液體間完成移動和分布。測試表明,鐵基ODS合金平均拉伸強度為602 MPa,延伸率為21%,大氣環(huán)境中1000℃下氧化100 h后增重0.4 mg/cm2。
[Abstract]:The Fe-based oxide dispersion strengthening (ODS) alloy was prepared by using aluminothermic synthesis process and rapid solidification technology. By optimizing the composition of aluminothermic agent, not only a-Al _ 2O _ 3 nanocrystalline particles were formed in the melt, but also the liquid phase amplitude modulation decomposition took place. Because the interface between a-Al2O3 and Nia-rich Al phase can be lower than that of Al2O3 / Al2O3 and Nia-Al2O3 / Al2O3. The thermodynamic possibility of the liquid phase amplitude modulation decomposition of the reactive melt and the moving rate of the nanoparticles under the influence of interface energy and Brownian motion were analyzed. The NiAl phase is spherical, about 50 nm in diameter and 50 nm in volume fraction, and the synthesized aAl_2O_3 particle is about 5 nm in diameter, all of which are combined with NiAl by interfacial energy. Under the influence of interface energy and Brownian motion, the moving rate of Al2O3 particles is very fast. During the rapid cooling process, there is time to complete the movement and distribution between the two phase liquids. The average tensile strength of Fe-base ODS alloy is 602 MPa, the elongation is 21. The weight of Fe-based ODS alloy is increased by 0.4 mg / cm ~ 2 after oxidation at 1000 鈩，

本文編號：1555207