(上海交通大學(xué) 輕合金精密成型國(guó)家工程研究中心，上海 200240)
摘 要: 利用光學(xué)金相顯微鏡(OM)、電子背散射衍射(EBSD)技術(shù)，并結(jié)合室溫力學(xué)行為測(cè)試，研究擠壓、退火及室溫拉伸過程中純Zn的顯微組織，討論孿生行為對(duì)純Zn室溫拉伸性能的影響。結(jié)果表明：在純Zn擠壓及室溫拉伸、壓縮過程中， 壓縮孿生為主要的孿生類型；在純室溫單向變形過程中， 壓縮孿生導(dǎo)致了純Zn明顯的拉壓不對(duì)稱性。另外， 壓縮孿生變形在晶間發(fā)生傳遞，利用 因子值可以評(píng)價(jià)孿生在晶間傳遞的可能性，取向接近、 值越大的晶粒間越容易發(fā)生孿生傳遞。
關(guān)鍵字: Zn；孿生；拉壓不對(duì)稱；變形協(xié)調(diào)因子
（National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The microstructure evolution and mechanical properties were investigated by combined optical microscopy (OM), electron backscattered diffractometry (EBSD) and mechanical property testing at room temperature. The results suggest that twinning activates in most samples during deformation in Zn and causes tension-compression yield asymmetry during uniaxial loading at room temperature. And the paired twins are observed, where twins can propagate throughout the grains and consequently transfer strain to neighboring grains (termed as twin-twin transfer behavior). A geometric compatibility factor was discussed to assess the possibility. It indicates that the more similar of grain orientation and the larger of value are, the more likely twin-twin transfer tends to happen.
Key words: zinc; twinning; tension-compression yield asymmetry; deformation compatibility factor
