LUO Zhiping
,
ZHANG Shaoqing
,
SONG DeyuBeijing Institute of Aeronoutical Materials
,
Beijing
,
100095
,
ChinaTANG Yali
,
ZHAO DongshanZhengzhou Institute of Technology
,
Zhengzhou
,
450002
,
China Manuscript received
,
27 April 1994
金属学报(英文版)
In the as-cast Mg-Zn-Zr-Y alloys, the quasicrystal phases show massive and eutectoid plate morphologies. The selected area dijfraction(SAD) revealed that a large pan of the quasicrystals are face-centered icosahedral (FCI), while a small amout of the quasicrystals belong to the simple icosahedral (SI) phase. It was found that in homogenized alloys, a part of the grain boundry phases was dissolved,and small massive W-phase and lath-shape MgZn_(2) phase dispersedly precipitate in the grains. The transformation of the quasicrystals relates to the temperature. After homogenizing at 360 ℃ , the quasicrystals still present, while after homogenizing at 400 ℃ , the quasicrystals transformed into a new C-type orthorhombic phase witha = 0.975 nm, b = 1.137nm and=0.935 nm.
关键词:
Mg-Zn-Zr-Y alloy
,
null
,
null
D. N. He
,
X. F. Yin
,
H. Z. Thao
,
D. L*
,
X. Y. Ruan
,
J. L. Cheng and J. Y. Jiang 1) Shanghai Jiao Tong University
,
National Die & Mold CAD E. R. C
,
Shanghai 200030
,
China 2) Shanghai Vopkswagen Automotive Company Ltd.
,
Shanghai 201805
,
China Manuscript received
金属学报(英文版)
The deformation characteristic of bland in deep drawing is discussed. It is pointed out that the friction and lubrication conditions in for drawing are different from that in mechanical motion or machine work or other plastic process. The common test methods in laboratories are analyzed. It shows that though all those test methods can test the friction coefficient, the probe test method is most suitable for the research of friction and lubrication and the process in deep drawing, for this method is identical with the actual work condition either from the test principle or deformation status of the blank. Last the successful application in the deep drawing simulator newly developed the the probe method are intro- duced in detail.
关键词:
deep drawing
,
null
,
null
,
null
