(1. 上海交通大學(xué) 輕合金精密成型國家工程研究中心，上海 200240；
2. 上海交通大學(xué) 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室，上海 200240)
摘 要: 針對(duì)變形鎂合金存在的典型織構(gòu)以及織構(gòu)優(yōu)化設(shè)計(jì)方面的研究工作和進(jìn)展進(jìn)行綜合評(píng)述。鎂合金由于基面滑移和 孿生是最容易開動(dòng)的變形模式，在變形鎂合金中容易形成擠壓絲織構(gòu)及軋制板織構(gòu)。通過引入剪切變形，改變成型過程中外加應(yīng)力的取向，能夠有效地改變變形鎂合金的織構(gòu)，同時(shí)通過添加微量稀土元素Nd、Ce和Y等，能夠明顯弱化或隨機(jī)化變形鎂合金織構(gòu)。織構(gòu)隨機(jī)化后的鎂稀土合金具有較好的強(qiáng)韌性，合金的變形各向異性得以改善。添加稀土元素后會(huì)改變稀土元素與Mg原子間的鍵能，改變稀土元素周圍Mg-Mg原子之間的結(jié)合能等，增加非基面滑移的可能性，減弱基面滑移及 孿生所占的比率，有效地弱化鎂合金的織構(gòu)。
關(guān)鍵字: 變形鎂合金；織構(gòu)；基面滑移；孿生；織構(gòu)
（1. National Engineering Research Center of Light Alloy Net Forming，Shanghai Jiao Tong University,
Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The texture and texture evolution of wrought Mg alloy were investigated. The dislocation slip on (0001) plane and the tension twinning are the main deformation modes and resulted in the typical basal textures in Mg extrusion and sheet. The texture can be altered by changing deformation method, and the rare earth addition is another important way to weaken and randomize the texture of wrought Mg alloy, such as Nd, Ce and Y addition. The wrought alloy with random texture displays good strength and ductility, especially good tension-compression yield symmetry. The mechanism for texture randomization or weakening was also addressed. The rare earth (RE) addition may alert the bond energy between Mg atom with RE atom, improve the possibility of non-basal slip, but inhibit the basal slip and the twinning, and the texture is weakened.
Key words: wrought Mg alloy; texture; basal slip; twin; texture
