摘要
利用透射电镜观察了 Al- 4 Cr- 4 Zr- 2 Ti(原子百分比 )合金的显微组织 ,并测定了相应的显微硬度。结果表明 :快凝合金在 4 0 0℃ ,4 h时效达到峰值硬度 ,H v达 2 4 2 0 MPa,此时的析出相为 Al1 3Cr2 和与基体共格的亚稳相 L l2 -Al3Zr。合金经 4 0 0℃ ,96h时效后的显微硬度与急冷态硬度和峰值硬度相比仅分别下降 10 %和 14 %。而 5 0 0℃ ,4 h时效后 ,由于 L l2 - Al3Zr转变为 DO2 3- Al3Zr并且析出相粗化 ,导致合金硬度急剧下降。
The Microstructure of as-spun and as-annealed ribbons of rapidly solidified Al-4Cr-4Zr-4Ti alloy (at%) were examined by TEM. The peak microhardness Hv upon aging at 400 degreesC is up to 2 420 MPa, the precipitates corresponding to the peak hardness are Al13Cr2 and matrix coherent fcc metastable Ll(2)-Al3Zr. The microhardness of the alloy upon aging at 400 degreesC, 96 h is decreased only by 10% and 14% respectively compared with those as-spun and peak hardness. Aging at 500 degreesC, 4 h makes the microhardness decrease suddenly due to the fact that Ll(2)-Al3Zr is transformed to DO23-Al3Zr and coarseness of the precipitationg phases appear.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第4期303-305,共3页
Rare Metal Materials and Engineering
基金
安徽省教委自然科学基金资助 ( 2 0 0 0 j1172 )
