摘要
采用熔渣包覆水淬法获得了直径为 ６ ｍｍ，长度为 ５０ ｍｍ的非晶 Ｎｄ６０Ｆｅ３０Ａｌ１０合金，并对其非晶形成能力进行了研究．在三元系非晶合金中，除 Ｐｄ基合金外，这是目前所报道的采用水淬法所能获得的最大尺寸的非晶合金 对 Ｎｄ７０Ｆｅ２０Ａｌ１０，在同样的条件下可获得直径为 ３ ｍｍ，长度为 ５０ ｍｍ的部分非晶组织 与普通铜模铸造方法所获得的临界直径相比，前者提高了 ２ ｍｍ，而后者降低了 ４ ｍｍ．利用 ＤＴＡ 和 ＤＳＣ 对 Ｎｄ６０Ｆｅ３０Ａｌ１０合金的熔点和形成能力进行了分析，所计算的临界冷却速率为０．５５Ｋ／ｓ，表明该合金具有较大的非晶形成能力．表观晶化能计算结果和 ＤＳＣ曲线分析表明。
Bulk amorphous Nd(60)Fe(30)Al(10) alloy with a diameter of 6 mm and length of 50 mm was prepared by water quenching the molten alloy together with B(2)O(3) flux medium in an quartz tube. It is 2 mm larger in diameter than that fabricated by the copper mould casting previously. For bulk Nd(70)Fe(20)Al(10) alloy, however, it contained certain crystalline phase(s) when fabricated into a sample with 3 mm in diameter and 50 mm in length by the same method, being at least 4 mm smaller in diameter than that fabricated by copper mold casting. For the water quenching bulk amophous Nd(60)Fe(30)Al(10), its size is the largest except the Pd-based alloy in ternary alloy system. The calculated critical cooling rate is 0.55 k/s. The calculated apparent activation energy of crystallization as well as the results analyzed by DSC show that amorphous Nd(60)Fe(30)Al(10) has a low thermal stability.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期829-832,共4页
Acta Metallurgica Sinica
基金
国家重点基础研究发展规划资助项目 G2000067201
