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交叉預(yù)壓縮對(duì)軋制態(tài)AZ31鎂合金拉壓不對(duì)稱性的影響
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大學(xué)生創(chuàng)新訓(xùn)練項(xiàng)目 (1210611002)


Effect of Multidirectional Pre-compression on the Tension-Compression Asymmetry in a Hot-Rolled Mg-3Al-1Zn Alloy
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    摘要:

    通過對(duì)軋制態(tài)AZ31鎂合金板材進(jìn)行多向預(yù)壓縮，運(yùn)用塑性變形的方式，產(chǎn)生了{(lán)102}一次拉伸孿晶和{102}-{102}二次拉伸孿晶，并結(jié)合EBSD表征和XRD分析，對(duì)預(yù)壓縮后材料的拉伸壓縮實(shí)驗(yàn)的結(jié)果表明，預(yù)壓縮對(duì)鎂合金拉壓不對(duì)稱性的降低和強(qiáng)度的提高有明顯效果。交叉預(yù)壓縮之后，由于產(chǎn)生了孿生，材料組織晶粒細(xì)化，使得材料在再變形時(shí)，屈服強(qiáng)度和最大強(qiáng)度均明顯增強(qiáng)。產(chǎn)生的拉伸孿晶片層可以有效地改變晶粒的取向，在一定程度上削弱了基面織構(gòu)，在{102}一次拉伸孿晶中產(chǎn)生了{(lán)102}-{102}二次拉伸孿晶，二者結(jié)合作用，改善了材料的再變形行為，從而降低了鎂合金板材的拉壓不對(duì)稱性。

    Abstract:

    The effect of pre-compression on the tension-compression asymmetry in a hot-rolled Mg-3Al-1Zn alloy was investigated by Electron backscattered diffraction (EBSD) and X-ray diffraction (XRD). The tensile and compressive tests of the pre-compressed materials reveal that the tension-compression asymmetry is greatly reduced via pre-compression, which results in the production of twins facilitating the grain size refinement. Yield strength and peak strength are obviously enhanced. The orientation of the grains and the intensity of the basal texture are effectively modified through the twins resulted from pre-compression. Additionally, {102}-{102} twins are found to be generated in the previously formed {102} twins. The existence of these twins modifies the deformation behavior of the materials during re-deformation, which is beneficial to the reduction of the tension-compression asymmetry.

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陳慧聰,劉天模,徐 舜,苗滋春,張 政.交叉預(yù)壓縮對(duì)軋制態(tài)AZ31鎂合金拉壓不對(duì)稱性的影響[J].稀有金屬材料與工程,2014,43(10):2479~2482.[Chen Huicong, Liu Tianmo, Xu Shun, Miao Zichun, Zhang Zheng. Effect of Multidirectional Pre-compression on the Tension-Compression Asymmetry in a Hot-Rolled Mg-3Al-1Zn Alloy[J]. Rare Metal Materials and Engineering,2014,43(10):2479~2482.]
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  • 收稿日期:2013-10-13
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  • 在線發(fā)布日期: 2015-04-07
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