[12]Cu-7Al单晶体循环形变行为──Ⅰ.应变突发行为  

CYCLIC DEFORMATION BEHAVIOR OF [12]Cu-7Al SINGLE CRYSTALS Ⅰ. Strain Burst Behavior

作　　者：吴细毛[1] 王中光[1] 李广义[1] 

机构地区：[1]中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳110015

出　　处：《金属学报》1999年第8期789-792,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金!19392300-4

摘　　要：对[　12]Cu-7Al(原子分数，％）单晶体在循环形变中的应变突发现象进行了研究结果发现：在塑性应变幅γP1＝22×10-4和γP1≥2.2×10－3的条件下，表现出循环形变稳定性,循环应力随循环数增加无波动；但在γP1＝4．4×104-1．1×10-3的范围内，出现循环应力波动，发生了应变突发.在相同应变幅下,应变突发频率随循环数的增加而减小，随应变幅的增大而增大；应变突发时应力降低值D随应变幅的增大而减小，分析了试样在2．The strain burst behavior of [112] Cu-7Al(atomic fraction,%) single crystals during cyclic deformation was studied in this paper. The results showed that the cyclic stress response behavior si stable at γp1 =2.2 × 10-4 and γp1≥ 22.2 x 10-3. At γp1 =4.4 × 10-4 - 1. 1 × 10-3, strain burst occurs. The frequency of strain burst decreases with cycling at the same strain amplitude and the frequency of strain burst increases and the stress drop D decreases with increasing the strain amplitude. The evolution of surface slip feature was analysed at γp1 =2. 5 × 10 -3.

关 键 词：Cu-7Al单晶体 应变突发 循环形变 表面滑移形貌 

分 类 号：TG146.11[一般工业技术—材料科学与工程] O733[金属学及工艺—金属材料]