In order to gain an understanding of the hardness of a material
at a certain dpa, Kasada et al. [32,33] reported a new method to
evaluate irradiation hardening for ion-irradiated materials. The
hardness data were plotted as H2 versus 1/h, as shown in
Fig. 7(a). In the case of the unirradiated specimen, the curve
showed a good linearity in the range of h > 63 nm. However, the
irradiated CW316 SS appears to have a bi-linearity with a shoulder
(hc) at around 230 and 260 nm for the 0.62 and 3.7 dpa irradiated
samples, respectively. Under the critical indentation depth, unirradiated
SSE can contribute to the hardness from an increase in the
indentation depth. Taking into account that the critical indentation
depth (230–260 nm) is around 1/6 of the damage layer depth
(1400 nm), we can conclude that the Berkovich diamond indenter
tip will reflect the hardness in the region of the indent and extend
down approximately six times that of the indenter’s contact depth.
Furthermore, the H0 values obtained from the extrapolation of
hardness data in the 75 nm < h < 500 nm and 75 nm < h < 250 nm
range for the unirradiated and irradiated specimens were shown in
Fig. 7(b). It is evident that the nanoindentation hardness increases
with increasing ion dose
เพื่อที่จะได้รับความเข้าใจในความแข็งของวัสดุ
ที่ประมาณหนึ่ง kasada et al . [ 32,33 ] รายงานวิธีการใหม่เพื่อประเมินปริมาณรังสีไอออน
แข็งวัสดุ ข้อมูล
ความแข็งวางแผนเป็น H2 กับ 1 / H , ดังแสดงในรูปที่ 7 (
) ในกรณีของตัวอย่างการฉาย , โค้ง
แสดงเส้นตรงที่ดีในช่วงของ H > 63 nm . อย่างไรก็ตาม
irradiated CW316 SS appears to have a bi-linearity with a shoulder
(hc) at around 230 and 260 nm for the 0.62 and 3.7 dpa irradiated
samples, respectively. Under the critical indentation depth, unirradiated
SSE can contribute to the hardness from an increase in the
indentation depth. Taking into account that the critical indentation
depth (230–260 nm) is around 1/6 of the damage layer depth
(1400 nm), we can conclude that the Berkovich diamond indenter
tip will reflect the hardness in the region of the indent and extend
down approximately six times that of the indenter’s contact depth.
Furthermore, the H0 values obtained from the extrapolation of
hardness data in the 75 nm < h < 500 nm and 75 nm < h < 250 nm
range for the unirradiated and irradiated specimens were shown in
Fig. 7(b). It is evident that the nanoindentation hardness increases
with increasing ion dose
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