摘要
研究了ＴｉＡｌ基合金在氨气中进行的高温渗氮行为，采用ＸＲＤ和ＥＰＭＡ对渗氮层进行的测试分析显示，渗层由ＴｉＮ和 Ｔｉ２ＡｌＮ组成．其中ＴｉＮ分布于外层而 Ｔｉ２ＡｌＮ分布于内层 通过对渗氮前后的合金表面硬度和耐磨性的对比结果表明：经过不同工艺渗氮的试样其表面硬度及其耐磨性都有不同程度的提高，当渗氮温度提高到９４０℃，渗氮时间延长到５０ ｈ，试样的表面努氏硬度可达 １２８６ ｋｇ／ｍｍ２．
The nitridation process of TiAl based alloys in an atmosphere of purified ammonia has been investigated. The nitridation temperature range is between 800 degreesC and 940 degreesC and the major emphasis is at 940 degreesC. X-ray diffraction and electron probe analysis show that the formed nitride scale consists of two layers, an outward-growing and an inward-growing layer. The outward-growing part of the scale consists mainly of TiN, while the inward-growing part is composed of Ti2AlN. The hardness and wear resistance of the nitrided alloys are improved and at 940 degreesC nitridation, Knoop hardness value of TiAl based alloys can reach 1286 kg/mm(2).
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期837-840,共4页
Acta Metallurgica Sinica
基金
上海市科委科技发展基金项目 98JC/4016
