摘要
用高能球磨法制备了W-Ti预合金粉末,研究了纳米晶W-Ti粉末的真空烧结致密化和显微组织演化现象以及热处理时组织形貌的变化,并与未球磨粉末的烧结试样进行了比较。结果表明,提高烧结温度有利于提高相对密度;1500℃,2 h为最佳烧结工艺。机械合金化导致粉末内晶粒纳米化,形成成分不均的固溶体W-Ti粉末,使真空烧结后的显微组织结构明显细化,相对密度显著提高;扩散退火后能够形成成分较均匀的W-Ti固溶体。
W-Ti prealloyed powders were prepared by high energy ball milling（MA）,and the vacuum sintering densification behavior of the nanocrystal W-Ti prealloyed powders was investigated.The microstructure of the sintered W-Ti alloy before and after heat treatment was examined.The result shows that increase of sintering temperature is beneficial to densification of the sintered W-Ti alloy,and the optimal process is sintering at 1500 ℃ for 2 h with the W-Ti powder milled for 40 h.The nanocrystalline W-Ti powder prepared by MA is favorable for the densification and increases the relative density of the sintered alloy remarkably compared with that of the alloy sintered with as-received powder.W-Ti solid solution with uniform composition forms for the sintered alloy after annealing heat treatment.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第1期67-73,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学重点基金(50834003)
西安理工大学优博基金(210906)
关键词
机械合金化
W-Ti合金
热处理
固溶体
mechanical alloying W-Ti alloy heat treatment solid solution
