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ZK60及ZK60 (0.9Y)鎂合金高溫變形行為的熱模擬研究
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湖南省科技攻關(guān)項(xiàng)目（04GK1008-2）


Thermal Simulation on Hot Deformation Behavior of ZK60 and ZK60 (0.9Y) Magnesium Alloys
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    摘要:

    采用Gleeble-1500熱模擬試驗(yàn)機(jī)進(jìn)行壓縮試驗(yàn)，研究ZK60和ZK60(0.9Y)鎂合金在變形溫度為473~723 K、應(yīng)變速率為0.001~1 s-1范圍內(nèi)的變形行為，計(jì)算了應(yīng)力指數(shù)和變形激活能，并采用Zener-Hollomon參數(shù)法構(gòu)建了合金高溫塑性變形的本構(gòu)關(guān)系。結(jié)果表明：在試驗(yàn)變形條件范圍內(nèi)，合金的真應(yīng)力-真應(yīng)變曲線為動(dòng)態(tài)再結(jié)晶型；在573~723 K范圍內(nèi)，應(yīng)力指數(shù)隨著變形溫度的升高而增加，變形激活能隨著變形溫度和應(yīng)變速率的改變而變化。對比ZK60合金，ZK60(0.9 Y)合金的變形激活能降低了30%，且材料常數(shù)n和A值均降低。

    Abstract:

    The hot deformation behavior of ZK60 and ZK60(0.9Y) magnesium alloys was investigated by hot compressive tests on Gleeble-1500 thermal simulation test machine in temperature range from 473 to 723 K and strain rate from 0.001 to 1s-1. The stress exponent and the deformation activation energy were calculated. The constitutive equation of the plastic deformation of ZK60 alloy was obtained by introducing Zener-Hollomon parameter. The results show that the true stress-strain curves of the alloys have dynamic recrystallization character under the present deformation conditions; within the temperature range from 573 to 723 K, the stress exponent increases with the increase of deformation temperature and the increment increases gradually. The deformation activation energy changes with the deformation temperature and strain rate. Compared with the ZK60 alloy, the deformation activation energy of the ZK60(0.9Y) alloy decreases by 30% and the materials constant (n and A) also decrease.

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王 斌,易丹青,方西亞,劉會(huì)群,吳春萍. ZK60及ZK60 (0.9Y)鎂合金高溫變形行為的熱模擬研究[J].稀有金屬材料與工程,2010,39(1):106~111.[Wang Bin, Yi Danqing, Fang Xiya, Liu Huiqun, Wu Chunping. Thermal Simulation on Hot Deformation Behavior of ZK60 and ZK60 (0.9Y) Magnesium Alloys[J]. Rare Metal Materials and Engineering,2010,39(1):106~111.]
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  • 收稿日期:2009-01-05
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