李振亮
,
任慧平
,
金自力
,
张婧
,
陈伟
,
翟景
稀有金属材料与工程
利用喷射沉积技术制备Mg-9Al-3Zn-1Mn-6Ca-2Nd镁合金沉积坯,对其进行挤压预变形和二次压缩变形,重点研究热变形过程中纳米级含Nd第二相微观组织结构与再结晶之间的关系.结果表明:热挤压态镁合金中有孪晶存在,二次热压缩过程中非基面滑移是主要的变形机制;(Ca,Nd) Al2结构的C15型Laves相是Nd在镁合金中的纳米级第二相,在它们周围形成的密集位错网能影响再结晶的峰值应力大小.
关键词:
镁合金
,
再结晶
,
含Nd相
,
孪生
,
位错胞
LI Geping
,
LI Dong
,
LIU Yuyin
,
HU ZhuangqiInstitute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang
,
China
金属学报(英文版)
For the as-cast Ti-55 alloy, the morphology of the alloy riser consists of coarse dendrite zone and equiaxial grain zone. The second phase particles are 2.0-25 um in diameter. Some particles appear at grain boundaries, the others precipitate within grains. The shapes of the particles are mainly ellipsoids, and a few kinds of short needle-like and block v morphologies. The Nd-rich phase particles are enriched in the liquid before the inter face and are engulfed along the solidification plane-front. Finally, bands of Nd-rich phase par-ticles form parallel to the advancing solidification plane-front.
关键词:
Ti-55 alloy
,
null
,
null
LI Geping
,
GUAN Shaoxuan
,
WANG Qingjiang
,
LIU Yuyin
,
LI Dong
,
HU Zhuangqi (Institute of Metal Researeh
,
Chinese Academy of Sciences
,
Shenyang
,
China Manuscript received 23 January. 1995)
金属学报(英文版)
The morphologies of the Nd-rich phase particles in the Ti-5Al-4Sn-2Zn -1Mo-0.25Si-1Nd alloy after high temperature deformation are investigaied by optical microscope and transmission electron microscope. It is found that the Nd-rich phase particles are 1.0～14 μm in diameter and uniformly distributed in ihe matrix, and the majority of the particles are elliptical. Under high temperature deformaiton, high stress concentration occurs on the particles, the particles near to sphericity are obtained.
关键词:
: Ti alloy
,
null
,
null
G.P.Li
,
D.Li
,
Y.Y.Liu
,
S.X. Guan and Q.J.Wang (Department of Titanium Alloys
,
Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
TEM examination proves that the second phase particle within the as-forged Ti-55alloy consists of either bright or dark "matrix" (nano-Nd3Sn) and some small dark blocks (SnO) dispersed in the "matrix". The HREM observation shows that the nanoNd3Sn phase is roughly spherical and about 3-15nm in diameter, and the grain boundaries with atout 1nm width are "gas-like" structure.
关键词:
Ti alloy
,
null
,
null
