|
|
|
| PREBAINITIC TRANSFORMATION IN A Cu-Zn-Al ALLOY |
| ZHANG Jihua; CHEN Shuchuan; XU Zuyao (T. Y. Hsu)(Shanghai Jiaotong University) |
|
Cite this article:
ZHANG Jihua; CHEN Shuchuan; XU Zuyao (T. Y. Hsu)(Shanghai Jiaotong University). PREBAINITIC TRANSFORMATION IN A Cu-Zn-Al ALLOY. Acta Metall Sin, 1986, 22(5): 16-22.
|
|
|
Abstract The change in internal friction and frequency associated with the bainitic transformation in a Cu-25.83Zn-3.96Al(by wt-%)alloy was conducted by a new type of instrument under isothermalholding with 0.7 Hz. Results show that the internal friction exists a maximum value Q_(max)~(-1) within the incubation period. Q_(max)~(-1) increases with the raise of the isothermal temperature, and the time up to Q_(max)~(-1) decreases with the increment of the holding temperature. The frequency value is lowest at the initial time until it reaches a stable value. While the specimen is measured under a tension of 8×10~5Pa, Q_(max)~(-1) is far larger, the time up to Q_(max)~(-1) is shorter and the initial frequency value decreases more abruptly than that under the above unloading condition. The bainitie transfromation of the alloy exists a lattice softening phenomenon somewhat similar to that in thermal elastic martensitic transformation. The prebainitic transformation within the incubation period of the bainitic transformation occurs basically with the nucleation pro cess. Based upon the theory of phase transformation and the theory of local softening mode, a rule of the change in isothermal internal friction can be interpreted through the change of the nucleation rate within the incubation period.
|
|
Received: 18 May 1986
|
1 Delaey. L.; Deruyttere. A.; Aernoudt, E.; Roos, J, R., Shape Memory Effect, Superelasticity and Damping of Cu-Zn-Al Alloys, Department Metakunde, Katholieke Universiteit, Report 78R1-1978．
2 Takezawa, K.; Imamura, H.; Tanizaki, K.; Sato, S., J. Phys., (Paris), Supplement, 43 (1982) , № 12, C4-741．
3 张寿柏;陈树川;张骥华;徐祖耀,第一届全国固体内耗学术会议论文摘要集,中国物理学会内耗与超声衰减委员会,1984． p.186．
4 张骥华;陈树川;徐祖耀,物理学报,35(1986) ,379．
5 Devonshire, A. F., Philos. Mag., 40 (1949) , 1040．
6 Devonshire, A. F,, Adv. Phys., 3 (1954) , 85．
7 Clapp, P, C., Phys, Status Solidi (b), 57 (1973) , 561．
8 Clapp, P. C., Metall. Trans., 12A (1981) , 889．
9 Russell, K.C., Phase Transformations, ASM, 1970, p. 219．
10 Feder, J.: Russell, K. C.; Lothe, J.; Pound, G. M,, Adv. Phys. 15 (1966) , 111．
11 Dejonghe, W.; Batist, R. De.; Delaey, L., Scr. Metall., 10 (1976) , 1125． |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
