本文選題：La含量 + 鉬制品�。� 參考：《粉末冶金材料科學(xué)與工程》2015年06期

【摘要】：利用金相顯微鏡(OM),掃描電子顯微鏡(SEM)及透射電鏡(TEM)對鉬制品制備過程中組織演變進行研究,并分析La含量對制備過程中組織和性能的影響。結(jié)果表明:隨La含量升高,粉末的粒度變細,比表面積增加;添加微量La,可提高鉬制品旋鍛態(tài)的抗拉強度和伸長率,隨La含量升高,鉬制品旋鍛態(tài)的抗拉強度升高,當(dāng)添加1.0%La(質(zhì)量分數(shù))時達到最大值647.9 MPa,而伸長率先升高后降低,在0.1%La時達到最大值44.7%;透射電鏡的分析顯示,鉬制品旋鍛態(tài)中的第二相顆粒為分布在晶粒內(nèi)部的La_2O_3顆粒,可阻礙和儲存位錯以提高材料的強度和韌性。鉬制品拉拔態(tài)的抗拉強度則隨退火溫度的升高而降低,在各個溫度退火后,添加0.03%La時的抗拉強度均為最高;并且純鉬制品拉拔態(tài)的再結(jié)晶溫度為1 300℃,摻La鉬制品拉拔態(tài)的再結(jié)晶溫度高于1 700℃。
[Abstract]:The microstructure evolution of molybdenum products was studied by means of metallographic microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM). The effect of La content on the microstructure and properties of molybdenum products was analyzed. The results show that the particle size and specific surface area increase with the increase of La content, the tensile strength and elongation of molybdenum products can be increased by adding trace La, and the tensile strength of molybdenum products in rotary forging state increases with the increase of La content. When 1.0 La was added, the maximum value was 647.9 MPA, while the elongation increased first and then decreased, and reached the maximum value of 44.7 at 0.1%La. Transmission electron microscopy analysis showed that the second phase particles in molybdenum products were La_2O_3 particles distributed in the inner grain. Dislocations can be blocked and stored to improve the strength and toughness of materials. The tensile strength of molybdenum products decreased with the increase of annealing temperature, and the tensile strength of molybdenum products was the highest after annealing with 0.03%La, and the recrystallization temperature of pure molybdenum products was 1 300 鈩，

本文編號：1921975